gomule-d2r VS D2SLib

Yes, the stash is the same. You can also use external muling programs (GoMule) for infinite storage

GoMule

You can still use a tool like GoMule or Item Manager for infinite storage, just not with the in-game stash.

It's personal preference really. As a mostly solo player you just have to ask yourself if you prefer being able to trade, and having the possibility of playing with others occasionally, or if you prefer the QoL benefits of /players, static maps, infinite storage space (e.g. GoMule), and mods (e.g. basic-qol).

That's a good idea to save space in your stash. I'm surprised though more people playing D2R aren't talking about using GoMule to basically have infinite storage space. To my knowledge, it should work with Diablo 2 Resurrected just fine and allow you not to waste time upgrading runes and spend more time farming for high runes (and just leaving lower runes than probably a Lem rune on the ground.) The link to GoMule is here: https://github.com/pairofdocs/gomule-d2r

Personally, I would just keep the standard inventory size and use GoMule for storage though. I think the normal UI looks a little better, works properly wirh controllers, and is compatible with GoMule (which is the only way to have infinite storage space in D2R).

It's built with C# so it requires .NET framework to run, which should come with Windows. Using the superb D2SLib library (by dschu012 of the slash diablo community), it can be easily updated within minutes for future seasons. Supports characters (.d2s files) from PD2 and vanilla v1.10+ as well as shared/personal stashes (.sss and .d2x files) from PlugY v11.02+.