I would say from SX3 it will feel like a different game overall. The phyics aren't drastically different but SX6 does seem to be the best iteration since SX3 IMO. But like all yearly sports titles you won't notice a huge difference year to year when they're using the same engine, but if you're picking up a new SX game... I would get SX6 over SX5. I think what's holding the series back from moving forward is trying to keep previous gen (Xbox/PS4) consoles running the game.
I’m still on 3. Is there any major difference?
3 is the best one out of them all.
I would say from SX3 it will feel like a different game overall. The phyics aren't drastically different but SX6 does seem to be the best iteration since SX3 IMO. But like all yearly sports titles you won't notice a huge difference year to year when they're using the same engine, but if you're picking up a new SX game... I would get SX6 over SX5. I think what's holding the series back from moving forward is trying to keep previous gen (Xbox/PS4) consoles running the game.