I tried both and went with Joplin - it was a while ago and I can't remember exactly why, sorry. Import from EverNote would have been a factor (Obsidian may have this too?) as well as being FOSS. I use my notes as a personal knowledge base more than note taking so I have a lot of clipped web pages and linked notes so it could be that Joplin just suits my use case better. Obsidian didn't leave me with strong negative feelings just didn't fit what I wanted to do. Hope this helps.