Either way, it's definitely the best of the Bomberman games for the PC Engine. If you're only going to get one, or just want to know which to get first, it should be this one.
I do not agree perfectly with SIGNOFZETA. Bomberman SS is indeed one of the best versions, especially since it is the only one including a 10-player mode. But I think the multiplayer levels are slightly less challenging and the controls are a tiny little bit less precise. So in my opinion, this version (in 5-player mode) is unbeaten. I give this version a plain 10 while the Saturn version is a 9.5 for me.
Probably the second best Bomberman after Bomberman SS on Saturn. Very good graphics, wonderful music. Much prettier than the Mega Drive port of the same game (Mega Bomberman). The one player mode was the most fleshed out of any Bomberman at the time. A must-buy PCE game.