rock & play or swing?

R
FTM here, and I don't know what to put on the registry. So, I have a little house, and I don't want a ton of gadgets/baby equipment that I don't need. I have had people say that a rock and play is the best thing ever, and the same about swings. The  rock and play I'm looking at has all the features of a swing (plays music, vibrates, has a little light show, auto rocks, etc), but it doesn't actually SWING, and I know some babies prefer that. The swing just takes up so much more room and is less portable. 
I really don't want both. Thoughts and advice from experienced moms are welcomed!