There isn’t much variety, it’s mostly simple mods that rebalance the combat/loot/mob density. Or QoL like stackable runes.

For the first time player, I’d just grab something that makes the loot reasonable and keep the rest vanilla. For experienced folks, there are some full rebalance mods. Can’t recommend a specific one, I only played shortly after release so idk what is still maintained.

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Neither game is really designed as a single player experience.

Only time I’d consider buying D3 is for couch co-op, but that’s console exclusive. The story is over before you know it and isn’t even anything to write home about. Very grindy after story mode. Combat mechanics still fun if that is what you’re after though.

D2R has its own share of problems, but there is one giant thing going for it - mods. You can bypass the abysmal drop rates for cool items and play SP without much grinding even on highest difficulty (Hell).