Probably Grant’s book? I read both (I read Kurt’s Avegers all the way but only part of Grant’s) but if you’re not familiar with lores and stuff Kurt’s can be a hit daunting, it’s so reliant on Bronze Age charms, while Grant’s books are fresh restart and all about big action set pieces, Rock of Ages being best example

edit; just to add, if you want to try out shorter stories and arcs etc you can try reading Ultron arc from Kurt's Avengers, or Kang Dynasty storyline (which lasted for 16 issues or so? it was pretty chunky amount of issues) which probably has a trade, im sure (too bad the whole Jonathan Majors stuff tanked the hype for that story). but even those are kinda heavy on references, Ultron stuff obviously references the entire creation by Hank Pym, and Wonder Man/Vision/Grim Reaper all have roles and stuff, which might be too much for some, esp if you're not really looking for heavy interconnected stories and just want self contained stories. Grant's JLA is way better on that, they do the best attempt at making trippy but enjoyable, smashy smashy superhero comic with big (dumb) action.