Quoted from oldcarz:
Having both, side by side, my personal opinion is that they are really about equal. Both have multiple ways to win and you can have a few stinker balls and rally toward the end of either game and win replays.
I like that art a little better on the Grand Slam...Parker "cartoonish" with lots of activity.
But as Pinballprowess states, they are both in the same ball park!
Well, if nothing else... there goes my "nothing even comes close" out the window.
I forgot about Sluggin' Champ... to be honest.
And even though I'll still stick with Grand Slam being the better of the two... I would also say Sluggin' Champ is easily in the higher tier of 'any' Gottlieb woodrails, baseball themed or not.
I know a woodrail collector (actually we both know him) who says Sluggin' Champ is his favorite game. Any time a collector says this about a game... it always sticks in the back of my mind.
Plus I'm a 'huuuge' fan of button rollover specials, I just think they're, well... special.