I havent tried the trinity or the luxe, but that is a more beginner fun pack. Depending on where you want to go with your riding and what your riding style is, you should decide your board. If you're still a beginner but are looking to really step it up, Id go for the melissa, its a more "high-end" board and is very friendly with beginners as well.
If you see in the Ronix catalog it does say that the trinity shape is for the Sunday rippers or something like that, meaning (IMO) its mostly for people that ride occasionally and want a really forgiving user friendly for beginner levels board.
You should go for a size 134-5 whichever board you decide