Yes, i'd recommend it. The graphical quality in the Homeworld 1 Remastered version is greatly improved. It looks and feels amazing.
The UI is greatly improved too. The game's had a lot of post-release balance fixes/updates that have made it much more enjoyable now. You can pit HW1 races against HW2 races in battles and it's fun.
I used to play online matches with Comr4de against the hard level AI and it was pretty fun. We did some sweet Gundam and Yamato-ish mods that totally changed the game in fun ways.
However Homeworld 2 Remastered is literally no different from Homeworld 2 classic. They didn't bother updating the model or texture quality of the ships and objects in the game, and personally that pisses me off because it's like they were too lazy to fully remaster everything.
Get it while it's on sale. It's not worth the full price IMO.