Well Jon, here's my tuppence worth based on when I was playing it quite a lot between August and October, when it seemed like I could
hardly ever lose on it.
Dilophasaurus is the one with the biggest variance IMO. It is the one that is most likely to give you the big fat zero round, but then again, it is
probably the most likely to give you the 1000x or better round (the screenie threads would seem to back this up). My best win on it is 215x bet, followed by a 204x bet. One day I'll get that damn feature to make all the stars align. I only tend to pick this feature when already ahead.
T-Rex has been the kindest to me (3 wins over 500x bet, including two that were 810x bet). But it can be very frustrating. I've had a couple of rounds where I got no less than 5 2-reelers in a 12 spin round. And won zero on all five. Despite that, it is still my go to feature.
Velociraptor is (as bruinsdude correctly said) the "safest" bet, if you need a 30x to 100x win to keep yourself afloat when getting low. But it's pretty capable of dishing out a big one. Maybe not as good as T-Rex or Dilopha, but it can certainly go north of 300x bet. Despite the fact that I choose this feature quite rarely, I have managed a best win of 390x bet. My next best is 104x bet.
I really do not like the Brachiosaurus and Triceratops features. The number of wasted wilds on both of these is just ridiculous. I probably favour Brachio over Tricera because it has the ability to re-trigger . Tricera's ability to give you a respin only to then hit you with the equivalent of a 3 reel Wild Desire that pays sweet FA does not help. It is a very poor version of Sofia's running wilds on Playboy IMO. Best win on Brachio is 224x bet, best win on Tricera is only 154x bet.
To answer D2Hammer's question (and also to tell Jon that you were NOT dreaming it - you were looking in the wrong thread mate), yes it is possible to get more than 3 wild reels. I haven't managed it yet, but someone on this forum has....asghan
https://www.casinomeister.com/forums/threads/show-me-the-money-screenshots-min-1000xbet.32622/
I would probably follow bruinsdude's advice on feature selection. Failing that, maybe just go from left to right no matter what happened on the previous feature so you at least get to enjoy the variety?