Believe me, just like every profession, I've struggled for 15 years to perfect and master my craft. It's like the saying "easier said than done." Or "it's harder than it looks." But if you keep at it, then you can also master even the hardest car.
These are two different brands and they both have their pro's and con's. I can't really speak on the performance of 3M beacuse I am not a 3M dealer but I have installed their products before. I can share my personal opinion to answer your question. I would say that my experience installing/removing Vortex has been better than 3M. I personally do not like the over color of 3M because it seems to have too much green vs. Vortex has a more smoked black look to it.
Save yourself the hassle and just cut the tint in half. Work the smaller piece under the spoiler. My tint is still holding after 2 years. No peels or bubbles.
I typically use both methods for the best results. First I use my blade to remove excess film then I use the file to get a smooth rounded edge so it doesn't peel back.
