The only thing with co-op is that the trolls...and other monsters... all scale up in difficulty and get harder. Having played mostly co-op with 3 to 6 players, it's almost a holiday going back to solo
If you have a decent team of mates though, it's way more fun, loads of laughs as well as being a joint effort rebuilding and stocking the base. Having spent more hours in Valheim than my mates who regularly play, I'm kinda handy for building the gear they can't...but we all have different skill sets...
I get bored too quickly building a decent base on my own so most of my efforts are barely better than a shack with a fence, all cluttered with stuff I couldn't be bothered stacking. One of my mates who loves designing and building stuff does most of that whilst I supply all the recipes, weapons and gear, get the various wood types, forge advanced metals plus build the forges, smelters and the like...and build the bits I'm good at like levelling the ground and building the perimeter fences etc.
The others get some benefit since once they use the advanced stuff I can craft, they also gain the skills to craft and use them in their own solo games. We all get the benefit of having very nice forts in our solo games that we didn't have to build on our own
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