One of the reasons clear coat comes off is the application process. If you read the mfg. tech sheet on most base/clear processes there is a recoat window, that being, you have a limited amount of time to apply the clear over the base coat in order to get the desired "cross linking" between the two different products. If you exceed this time and do not "recoat" before clear is applied you could have an adhesion problem. Not a real issue if you follow the mfg. instructions. Most base coats are easy to apply, dry quickly, and can be taped on to apply additional colors/stripes. Just be aware of the recoat window clock starts when you apply the first color.

If you're not an experienced painter, I would use a base coat/clear coat system. The best paint gun you can afford (I use a SATA) and a good buffer polisher. If you have runs or orange peel on the base you can fix with sanding. If you have runs or orange peel on the clear coat you can fix then color sand (fine sanding and buffing) an area, or if you need to, the whole airplane. There are some good videos like Paintucation which will teach you the techniques. I have had good experience with Sherwin-Williams but a good automotive paint will work. I have found a good epoxy primer works well. If you want a better finish (unless you have polish ready construction) then I suggest doing any bodywork over the epoxy then a coat of urethane primer and light sanding.

Ken
4 airplanes completed as an amateur

I am an amateur at painting, I chose bc/cc, it was easy for me as an amateur, a few runs got wet sanded out like they were never there, orange peel, the same.
I used kirker and am happy with the results. Pics on link below. Time will tell.

Bird

BC/CC
 

Observation. Maybe BC/CC has improved over the years. I'll let you guys test the theory!:). Just call me an old school/old fogy!:D. I like my single stage paint.