I recently bought a PRS SE 245 for my 17yr old nephew. He's been playing a Gibson Les Paul Studio for past couple of years. His comment on the PRS was that it was the best guitar he's ever played - given the fact he hasn't played that many, it does speak to his opinion of the LP. The 245 is setup exactly like the LP, but he prefers it over the LP. If you're playing an Epiphone LP, then I would imagine you'll be as floored as he was by the differences in quality & detail. I think that's what my nephew is talking about when he says it "just feels better". It's the little details, the tuning stability, especially when changing from standard to alternate tunings like he does. I would assume the Epiphone has a wide/fat neck shape that's standard on them. The SE line has either wide/thin or wide/fat as neck options, so may feel more familiar to you if you go with a wide/fat. The S2 line mentioned above has the PRS Pattern neck shape and this may not feel the same to you. Ultimately, you want a guitar the feels right, sounds right, and inspires you to play your best.
As for being more "professional", I'll just have to say this:
No instrument is "professional" or "amateurish" - the player is. If you play for money, you're professional. If you play for fun, you're an amateur (for the love of). The instrument is meaningless in this context, since you can be professional with a $50 pawn shop beater or an amateur with a $12,000 PRS Private Stock. What you make of it is what determines if it's professional or not.
If a PRS feels more comfortable, sounds more pleasing, and thus makes you play better - then that's the way to go. If you have no issues with the Epiphone, then I'm not sure what you're expecting with a PRS.
FWIW, I was at a store this weekend and played a PRS SE One. It is a minimalist type guitar, one P90 pickup, one knob (volume). No tone knob, no tremolo, just simple raw P90. Although I have 3 US built PRS guitars, and the SE One is the most inexpensive PRS SE I've ever found - I had an absolute blast with it! It was just pure fun playing the thing, really grungy punk grit to that pickup. I'm trying to decide whether I want to grab it while I can, just because it'll be so much fun to just rock out on it. I would think that's the type of impact that should drive your decision.