Say what you will about GW and their business practices but their plastic kits are amazing. If any company could get that same level of quality I would say switch to it.
However, I am not a fan of PP plastic kits. Preferring plastic I was already to jump on the bandwagon but after working with their stuff for a while, I determined personally, I did not like them.
If done properly plastic is the way to go, however, it appears that is easier said than done.
on that note, I really dislike resin. I'm one that loves to customize and I find resin the hardest to work with. (not to forget to mention resin dust is bad for you).