I was really confused going into this process myself a few years ago.
My first coating was Gtechniq C1/EXOv2. I read a lot about coatings themselves, and I even pulled a full white papers on nanocoatings, wetting properties and the like to learn more about them in general. Ironically, I picked probably one of the harder ones to apply since it is done in two parts and is time/temperature dependent. Nevertheless, with good planning and patience, the finished product was spectacular. I had two really bad high spots with my first application. In reality, only one was a high spot, and that was on my roof in the middle where my reach was challenged and my lighting was poorest. The other "high spot" was where I got some C1 on my glove and I put my glove on the window. I later noticed this hazy area that was actually crystalized C1. I had to buff it off!
I've used the following coatings: Gtrechniq C1, C4, C5, G1, EXOv2; 22PLE VG1, 22PLE VX-1 Pro; Pinnacle Black Label Diamond Paint coating, window coating and wheel coating; CQuartz, CQuartz DLUX; Gyeon Booster. I have have a bottle of Gyeon Mohs waiting to go and some Wolfgang Uber Ceramic Coating.
The easiest to apply and buff is PBL Diamond Paint Coating. By far, this was the easiest to apply and buff. The gloss was fantastic, but I was VERY disappointed with the longevity and the testing I did with 4 different prep products. Others have had much better experience.
I've used 22PLE VX1 twice, and it's pretty easy to apply and buff.
Gyeon Booster I didn't like. It flashed way too quickly for me. I have no idea if any product went down.
In terms of looks, the C1/EXOv2 and the 22PLE have looked fantastic, and the hydrophobicity is amazing for both of them. The C1/EXOv2 combo is very slick, but 22PLE is slightly grabby. This past time around, I coated the 22PLE with EXOv2, and I have a slicker surface.
I've heard Blackfire looks great, but several people have reported difficulty applying it recently.
Looking forward to using the WG Uber coating; haven't heard anything bad about it, and it seems to have the same look as many other coatings.
Next up: Gyeon Mohs with Kamikaze Overcoat.