To me, the practical latex version doesn't look more realistic than the CG one. (Although I'm only looking at them on my crappy phone.) And I actually prefer the sweaty shine they put on the CG skin over the dry, matte, dusty look of the latex. There's a reason why, for years, monsters relied on slathering gobs of KY-jelley to the latex skin to disguise the dry rubber look. Everything from Alien to The Thing, American Werewolf in London, and virtually every other monster from the 80s an 90s. They could have gone for silicon which has a more flesh-like realism but presumably the fragility of that material was a no-go for the rigours of location shooting out in the woods and the demands of physical action and stunts.
But really, the main reason for choosing the CG option is budgetary. It means you can push the art and craft effort into post. Doing it practically means committing budget and resources up-front. Leaving it to post means you get to review what's been shot and only allocate resources according to what remains in your schedule and funds. And you get start with the 'Must Do' shots and work your way to the 'Would Be Nice To Improve If We Still Have Money And Time' shots.
TC