I really like Ariados' final design but something about it doesn't feel quite as "spidery" as Spinarak's. I feel like they should have kept the wider, rounder body of the beta design, and maybe the beady eyes, while retaining things like the legs, two legs moving on to its back, and coloration of the final design.
I'm glad we have Galvantula but I hope we can see more spidermon that really look like actual spiders, I love spiders but Spidops just disappoints me compared to its prior evolution.