Tried them some time ago and both been fine.
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Vanilla++ is built fresh from patch 2.4 and includes many of the best QoL and other gameplay mods. It is developed by the largest D2R modding community while focusing heavily on player feedback, suggestions and ideas. We may provide the files; but you are the ones really making the mod.
ReMoDDeD is an overhaul mod with over 1500 custom files, dozens of new levels, monsters, visuals and a whole new gameplay experience for D2R.
Classes, Skills and UI have been re-designed for varying gameplay aspects. It is easily the most advanced D2R mod out there and it's still in Alpha phase.