Popularity differs from area to area. I'm in an area where i am now getting asked for 50% gel and 50% L&P (Acrylic), but have just moved here, and previously in 2 years I only had 1 L&P client, and she switched to gel after seeing it on my nails anyway. Yet 5 years ago, no one did gel in that area. (Quite a lot of clients also thought they were getting gel....thanks to the local NSS questionable advertising policy)
Look at what the salons around you are offering, ask your existing clients what they have or would have. I wouldn't say gel is easy to learn after L&P.....may L&P techs can't get to grips with the different brush technique (although many do). That said I wouldn't say it was any easier the other way round either.....they are two very different systems and will require 2 courses.
The best advice I can give you, is choose a supplier that has strong products in both systems and you can embark then on a training program that will enhance your skills and not two different styles of prep, apllication etc...
