Picking one that is new is not really way to go, you can't really see or predict if they will be legit or not. If you really want to go with a reputable one, then pick stuff like stake, freebitco.in, sportsbet.io, roobet and stuff like that. These are not the only ones, there are others of course, I am just saying that the "idea" on how you should pick. These have been around for many years and they have been legit for many years as well. This means you do not have to do anything while picking, because these places already showed you that they are legit and what else could you want from a casino as a gambler? Them being legit is the only good reason. So look at old ones that are reputable and you should be fine.
Gambling sites that you list above are all legit but I think they have differences when it comes to house edge and rtp. Freebitco is said to have a higher house edge on it's hilo game but for the others, it depends on their games because they have different kinds. I still do play on freebit despite of their high house edge and believe it or not I have win and withdrawn many times on them.
Just want to say that a high house edge should not discourage someone to try his luck because he'l never know maybe he is more lucky on it than the games with lower house edge? and what can a site with low house edge do, when they will still scam you at the end.