I think JuJutsu Kaisen is a far better choice. It has a fun, well written cast of characters, amazing animation, amazing fight choreography, great female characters, cool powers, great voice acting, nice music, and while it has a lot of shonen troupes in it, it executes on those troupes very well. It’s not a phenomenal anime or perfect in any way, but it’s a fun watch, and easily one of the best new gen shonen. It’s also only 24 episodes long, so you could watch it in a couple days.
Black Clover is far longer, has bad animation, the mc is annoying at first, it takes a little while to really kick off, and it’s just not as fun imo, and doesn’t do much better.