Med-El do have wearing option
One is tiny top part with plastic ear hook that hold all around in back of ear and bottom part pin on shirt, all ear-level, or whole processor (its same size as ear level but not curved its straight to clip on shirt) it have longest electrodes it cover most low frequencies that nucleus and bionics don't cover, Med-El is wonderful as nucleus 5 is too nucleus 5 wearing option is top half held on ear and bottom half pin on shirt, whole processor but curved like all ear level design pin on shirt. Its very water resistant that with rechargeable battery it can be submerged in 3 feet of water for short time and put in dry store to dry it out and it work perfectly fine. With disposable battery its sweat/rain proof like previous model. Both Med-El and nucleus 5 have rechargeable AND disposable battery option, very thin and light processors, nucleus 5 have most reliable and strongest internal implant with most stimulation sites (22 electrodes) Med-El have 12 but its longer strip of electrode to stimulate more area and cover most low frequencies that other doesn't. Nucleus 5 is very upgradeable and backward compatible and popular choice. Med-El is least choice out of 3 (advanced bionics is other 1) but honestly it made huge improvement in 2009 and I think its great brand. Advanced bionics is same length as nucleus 5 electrode but with 16 electrodes, have fancier sound/speech strategies (spelling?) fastest processing speed, have most "sound window" I forgot what the technical term for that it have 80 db when other (nucleus and med-el) have less but I don't understand that part and don't think it make any real difference? No idea, ask advanced bionics users.
You can't go wrong with any of 3 brands everyone with all brands are happy so good luck!