Personally I'd throw out BOP right away, sounds great yad yada one shot pony.

Personally I'd go Space Shuttle but I could see Time Machien for some cheesy fun.

Time Machine > Space Shuttle > > > > > > > > > > > BOP

Owned TWO Time Machines and one Space Shuttle. The TM is a more fun to play than Space Shuttle, better stereo sound and chimes.

BOP I have no opinion.

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So, this is coming from me, someone with a large collection:

BoP is a a one shot pony, but it’s so unique and atmospheric. Doesn’t feel like anything else. I’d probably choose BoP.

BUT

In a small collection, I’d go for Space Shuttle. Classic game, and shots are varied and evenly spaced around the playfield. Friend of mine owned one for a while, and it rarely got old.

I owned all three at the same time.
Time Machine is a good game, but it got stale for me.
I would probably get rid of Space Shuttle before BOP.
Maybe BOP would be a bad choice as an only game, but there is really no wrong answer here.

Yeah there is. A couple, actually.

Time machine I think the music is entertaining.

I have a SS, but man it is a coinflip versus TM in my book. I would let the decision come down to theme preference and if you get a great deal. I can say I LOVE my SS and it is the one I turn on the most for a quick game. BOP theme is just not for me, but the game itself is fun to shoot. Jesus I realize how wishy washy my reply is ... fun one to debate

I've owned all 3-

BOP os a great looking game, but like others here have said, it5s a one shot pony and gets old quick.

Time Machine and Space Shuttle are equal for code depth and fun shots. Pick the theme you like best between those 2.