Like rx queen states, we're all different because I've been on both (at the same time, why, I don't know). I started with Trileptal and was fine with that for years. Polypharmacy began years later. I was on lamictal from 2015 to 2016 and I felt like an idiot. My memory was horrible, I paid for groceries and walked away on more than one occasion. When I saw a new pdoc while mine was on maternity leave, I asked to be off the Lamictal and I could remember things again.