How is your product different from https://seekwell.io/?

Right now we're focused on providing access directly from Sheets so you don't need to switch back and forth between multiple apps or pages. We also allow UI based filtering and sorting for those who prefer not using SQL.

https://www.scootersoftware.com/index.php - (I'm not the OP but I favour Araxis Merge https://www.araxis.com/merge/index.en over Beyond Compare)

I prefer FileMerge. Built in to osx/xcode I believe.

Give Semantic Merge a try https://www.semanticmerge.com