Dragon Ball Z: Kakarot finally brings what many fans have been asking for and takes the iconic franchise into new territory with a more open world and a ton of RPG mechanics. While this fan-service increase in power level definitely transforms the well-known story into a new form, it's still far from going Ultra Instinct.
Synth Riders isn't worse nor is it better than Beat Saber. It's its own VR rhythm beast that will appeal to a different kind of audience. If you can't resist some good retro-inspired, electro music and a Tron-esque neon aesthetic - this is definitely a game for you. You'll most certainly have plenty of fun and could even lose a pound or two in the process.