A couple of thoughts on PPF and ceramic coatings:
I have had at least 8 cars partially wrapped or PPF applied, and do my own paint correction and ceramic coating. Whether you go partial PPF or full car really boils down to your need for perfection, and how you use and maintain your car. Whether you ceramic coat or not is again based on your need for perfection vs protection from normal use. A friend of mine always reminds me...are you trying to protect the car as a collectable (museum quality - think 911 GT2) ) or to ensure you have a great looking car during your ownership? The QV will most likely never be a true high end collectable, but it is a stunning car that deserves great care.
PPF
When and where:
The QV has a flat (vertical) front end and a significantly sloping hood, so the front 20% is more exposed to normal roads (stone) imperfections. Additionally the combination of tires and exposed lower rockers and protruding rear wheel arch facia makes these areas very prone to stone chips. IMO the rest of the body should not need PPF....depending on your need for absolute perfection.
I have traditionally done the "front area kit" which is the front bumper, partial frt fenders and hood (straight cut), mirrors, and headlights (fog lights if available). If the hood is low and has a fairly steep upward angle (think 911), then I would do a full hood instead of a partial hood. I have never had any issues with normal paint damage to any part of the car that didn't have PPF. Some people don't like the break line on a panel, so for the hood, and possible front fenders I can understand those people may want full hood and/or front fenders.
* Warning: QV has special coating on the headlights and there are risks that if the PPF has been applied, it may not be able to be removed without damaging the headlights...requiring replacement of the entire light assembly....some Porsche have this same problem, and my installer will NOT do this without a waiver from the owner on those cars.
Which brand:
Frankly each of the films named are fine, and one may have a "claimed" benefit over the others, but once applied and used for a month I'd say 99% of the owners will never see the difference...I couldn't. Buy the one that works for you.....the quality of the job is 95% installer skill, patience and care.....as they say "its all about the installer".
CERAMIC COATING
As you are probably aware, the cost and labor for a ceramic coat is 90% in the labor put into the paint correction done before the ceramic ( or PPF) is applied. The better the paint correction the better the look. New cars and preowned cars both need paint correction, but usually preowned has other issues to be addressed (existing defects, stone chips, abrasions, scratches, etc. New cars still have defects, but it is usually limited to "orange peel", ripples and light swirls from the manufacturing and delivery process.....generally much much less time consuming.
Does ceramic "protect the finish"? In a word yes, but PPF is the more effective barrier and can actually "self-heal" from minor impacts, and but ceramic is even better than PPF in protection from surface swirls and light scratches....bc the PPF itself can be scratched or abrated, but can't be repaired, only replaced.
Note: a way to add an additional layer of protection to a car with PPF is to also have the PPF ceramic coated, depositing a durable over coating on a relatively "soft" PPF film.
WHAT IS ENOUGH:
IMO, any car worth owning should have either or both PPF and Ceramic coating, the question is to what extent and at what cost? For the perfectionist (of which I'm borderline OCD)...perfect is acceptable, and anything less is flawed. Although, there is a point where the effort and cost simply overcomes my desire for every car to be the perfect car.
I have at least the "front area kit" done on any of my new, late model or special cars cars, more coverage depending on the car and its purpose. Depending on the car this usually is a sub-$1000 cost. If more areas or full vs partial coverage is needed its usually $1200 - $1800 range. Note: I've never done a full car, but prices starting at $4000+ and up are common.
Ceramic coating itself is inexpensive and easy (material costs under $150), and can be applied within 2 hours. It is the paint correction that determines the cost and quality of the coating, I would venture to say that an excellent condition new QV would need under 8 hours to paint correct ($1000- 1200). A pre-owned is impossible to provide a figure but if paint chip touchup and correction are needed I would put the starting point at $1500 and it could be double depending on the condition.
WHAT IS RIGHT FOR YOU?
On my used 2021 QV, a good PPF (XPEL) front area kit with rocker panels and added rear wheel arch protection, plus a good self-detailing, paint correction and ceramic coating will run $1200. At retail probably worth $3500.
A complete turn-key total car PPF, paint correction and ceramic coating....my guess starts at around $6-7k retail. Remember its all about the installer when it comes to a perfect car.