If you have the cash I’d say the Hot Toys one, but besides that the NECA ones look better than the figma.
I haven’t found Cherno yet so I can’t really compare the two but Ryu Ranger came out last year and Cherno came out this year so you’ll probably have more chances to get Cherno later. A lot of people dislike Ryu Ranger for his shoulder covers but if you can look past that he’s pretty fun with all of his accessories.
Unless he has another form to be his final form it most likely will be a regular release since both Wizard and Fourze’s were and Gaim seems to be selling well enough to warrant it. As for his gun I’d hope so. Bandai is random with accessories so it’s hard to predict who will come with what.