Pipbin
No one kind really, if I see a pattern I like when I'm looking at buying some I get it! These are a few of the ones I've got:
www.femininewear.co.uk/domino-pads-bamboo-medium-regular-pads---raspberry-pop-3714-p.asp
www.plushpants.co.uk/pages/review.php?cat_id=4&sub_cat_id=106&prod=808&extra_cat_id=7
www.femininewear.co.uk/eco-femme-day-pads-3001-p.asp
They are quite expensive to buy initially so the suppliers usually suggest just getting one or two to try and build up a collection.
They are addictive though because they come in such lovely materials and patterns! 
I use the larger sizes because I have heavy periods due to fibroids that used to last about 5 - 7 days but I have found (like a lot of users) that my periods are not quite as long since using the cup, no one knows the reason for this but lots of users report this happening.
The cup I use is the size 2 of this one:
www.femininewear.co.uk/lunette-menstrual-cup---purple-cynthia-5000-p.asp
I can wear it all day even on my heaviest days and only empty it once because it is quite a large size but there are smaller ones as everyone is different!
The reusable pads have also stopped my attacks of thrush which again is an effect noticed by other users. Some users believe it's because they don't dry out the vagina/vulva and a lot of users believe that the problems with the disposable pads is the chemicals used to bleach them.
Sorry, that was a bit evangelical! 