We had a vibrating baby chair, but Ds didn't like it when it vibrated! He did love it when it was off tho. We were also given a swing by a kind friend and he loved this, we kept it in the kitchen for when I was cooking and the chair in the lounge...I loved both really
vibrating bouncy chair from fisher-price was the best buy from 28 days till 7 months of his 1 st year! he loved it! me too! we've got graco swing as well. absolute money waste for us as the chair is so easy to move around the house!
Vibrating chair - although didn't necessarily have to vibrate (the batteries kept running out so it often didn't!). Had to have toys on the toy bar though - DS loved them.
Swings just take up far too much room. DS's bouncy chair is folded up under the bed in his room - took seconds to do, no disassembling, etc. Also he didn't really like the one we inherited. But all babies are different - wouldn't spend a fortune on a brand new swing - try to get a second-hand one. But a bouncy chair - not expensive to buy brand new.
I bought a musical swing for my fifth child - received vouchers from DH's colleagues and didn't really need anything, so this was a luxury.
Overall, I thought it was a great thing, but you need a fair bit of floor space for a swing. They only last until the child is sitting up and attempting to climb out, so it's good if you are able to save it for a future child or pass it on to friends.
seconded imation, fp vibrating chair has been the absolute best and not too bad on batteries. he was a bit alarmed by vibrate at first, but loves it now and snoozes for far longer with it on (is a very wakeful baby). haven't tried a swing, didn't realise they could be used for so long - shall i get one too or do babies tend to prefer one or the other?
We have a mothercare vibrating chair, with an activity arch included. DS loved it, he did like the vibration, but you had to be careful, as it was easy to leave on by accident, and kill the batteries. I think it calmed him down.
He loved the activity arch and used it before he was big enough for a proper baby gym - improved his hand/eye.
It was easy to fold and store and I fed him in it for his first month of weaning, until he kept trying to sit up.
He did try a chair at a friend's house, sat for five minutes and then started to cry and wanted out.
I'd vote for a swing - another advantage is when they want to be up higher (e.g. when you're eating dinner and they're too small for a high chair)the swing is just about right. dd loved hers and am about to get it out of the loft for no 2. Of course with all these things you have to decide how much baby clutter you want in your house, but we thought it was good value - there seem to be a lot of secondhand ones out there now too. The batteries last ages btw.