I havn't tried eaither but I LOVE tampax compak and they're basically the same apart from the pearl looks smoother and white and compak is pink/orange/blue green.
If you put it in properly ie. far enough in you can't feel it. If you dont put it in properly it feels a bit uncomfortable but it doesnt hurt.
Again, I wouldn't know but I have never experienced leakage with the tampax. Although if they leak it means youve either left it in too long or its not the right one for you and you need to choose the nexy absorbancy up eg. light - medium - heavy flow
I have slept with in loads of times but your nt supposed to keep one in longer than 8 hours. Saying this I have and nothing happens but its not a good idea because of the risk of toxic shock syndrome.
I would thouroughly recomend tampons. Pads are a pain in the bum as there messy and gross and uncomfortable whereas tampons are much neater and you can't feel them/dont have to worry about people seeing them.
Saying that theyr'e not for everyone but it took me till I was 16 to pluck up the courage to try one and I would never use a pas again EVER.
Hope I helped sweetie, I added some extra links I thought you might find helpful
