Ever try to squeeze yourself into either one? I'd never try an outdoor park baby swing for fear of getting wedged in the seat too tightly. Do a search on Youtube by "stuck baby swing" and you'll see lots of people get stuck really good, some even having to be pried out by the local rescue squad. Talk about embarrassment!
Now, the indoor variety is another matter altogether. It's the smallest baby item I've successfully squeezed into without too much problem. Though, like highchairs, I can only fit in the older ones that don't have an outer plastic seat shell. This is very similar to the one we bought for our children 23 years ago: "SWYNGOMATIC" BABY SWING 35 YEARS OLD GREAT CONDITION - eBay (item 260319109529 end time Nov-30-08 10:52:01 PST) The seat is all canvas so it can expand to easily fit my hips down in it. The only drawback is the seat-to-top bar height is a bit short which means I had to lean back to avoid it while swinging.
Wish I had some extra cash to bid on this one because we accidently through out the box containing our original swing seat and swinging mechanism. It somehow got mixed up with boxes of junk we were tossing. All I have is the set of legs left. But, I'm determined to get an exact replacement for it. I've even figured out a modification to lower the seat about 6 inches so my head will clear the swing bar. A swing like this one was the first baby item I ever had *B dreams about being in way back in my teens, though oddly it was many years later before I actually got in one for the first time. Felt really exciting to finally experience IRL what I had dreamed about years before.