1. Stakes
This is the only one I know from the list on OP,... Never heard of the others, seems like new to me but it seems not. I rarely visit other platforms for games, for I'm already quite fond of using the one I used to know for a long time.
I'd give my vote to Bspin.io. I'm not a fan of flashy things. Their website design has a simple interface, yet safe.
Yeah, platforms that has simple interface are more acceptable IMO just like mintdice and playbetr.