Basically the "general" trend with the 224 bullets is like any other caliber, if you're looking at one end of the spectrum versus the other.
Light-for-caliber bullets (35gr-45gr) when used in the 223 are going to have the highest attainable muzzle velocities. They'll shoot the flattest out to a certain distance (150-200 yds at least usually) but will lose velocity the quickest usually due to their low weight. Most of the lighter bullets you can use in the 223 Rem are going to be intended as, or act like, frangible varmint bullets.
Medium weight bullets (50-60gr) will offer a balanced mix of velocity, flat shooting with less drop than the light bullets at distance. In the 223 a lot more "hard" bullet options are available in terms of target/FMJ bullets from the mid-weights on up. Mids-on-up also start to include controlled-expansion bullets (partition/TSX) suitable for larger-than-varmint use. You'll still find soft varmint bullets in the mid-weights if that's your thing.
The heavyweights (65+gr) will have the slowest muzzle velocities to some degree, but these bullets will shoot the farthest with the least drop and wind-drift the heavier they get. The vast majority of the heavyweights are match bullets, with some controlled-expansion designs. There aren't many "varmint" frangible designs in these weights at 223-rem velocities, but I guarantee you a gopher won't know an 80gr matchking in the head from a 40gr Vmax
Personally I tend to like the mid-to-heavyweights but I also shoot a few "big 22's" on top of a 223 Rem. Fast enough and anything explodes hehe. If you shot a ton of close-range-only target and varmints I'd say you'd be happy with a slow twisted barrel. Personally think 1:9 will do you perfect unless you want the heaviest-heavies. And in my wordy opinion, bullets much above about 65gr don't offer much benefit until about 400+ yards.