The best beyblade burst beys?

Okay so, I’m getting back into beyblades. I own plenty of the metal series ones and a few of burst. I don’t think I like the design of beyblade X as much unfortunately so I’m looking to buy some beyblade burst beys.

What was the last season? Are the burst beys still relevant? Which ones should I go for? I really like world spriggan and vanish fafnir but none are available for me.

As a head’s up, I already own spriggan requiem, 3rd gen fafnir, 4th gen valkyrie and nightmare luinor