If your super serious about training tricks for winter maybe using roller skis is better but blades are just easier/funner and will still get you familiar with different spins. In my experience its gonna feel different when you are actually on top of a real ski jump regardless of whether you trained on roller skis or rollerblades so I would go with the blades.
Also, when you have blades, you can get tons of hits on the small jump onto the airbag. I like doing this so I can get used to spins without having to crawl out of the foam pit every time, plus when you land on the airbag you get a better feel for how balanced you will be when you land.
[video]https://www.newschoolers.com/videos/watch/1050302/PXL-20220822-004748265-mp4[/video]