i use both...i do up to 30 costumers every week since a Florida local newspaper wrote about it 2 months ago. the process n final looking is very similar. i personally think shellac is harder than gelish..i notice that the nails start shipping n splitting more with shellac..they get very dry.(u dont notice this when u do it in a already damaged nail,i have costumers who actually went back to traditional manicures cuz of this, btw i dont even prepare the nail how they sugest, a ligth buffer is more than enough for me) i never discuss this a lot with my co-workers cuz advertising could be very influent. this is just my opinion.i use gelish on myself,last 2 weeks n i work without gloves.