Segelei are on my list, I have an iPV3+ and have not had any issues with it. I have dropped it, taken it through snow and rain. Buttons are still nice and smooth.
Really you can't go wrong with either one. Segelei does have door magnets which is a plus.
as far as RTA what are you looking for? Since you use a dripper I would recommend the Silverplay, large deck, kayfun compatible, Massive wick channels, wide range of airflow and a large chimney give it a very dripper style vape. Plus it wicks like a beast at 50 watts even, one of my fav tanks.