This is one of thos questions where everyone usually answers with whichever pipe they have, lol. Just to buck the trend, I have a Yoshi pipe, and I love it, but if I was to go buy a new pipe today I'd likely switch to an Akropovic. As far as I'm concerned an Akro is the only thing I've found that actually sounded better than my Yoshi.

One other thing you should really be asking yourself isn't which sounds best, so much as, how loud do you want to go. Two Bro's sound decent but have a reputation as loud as all hell pipes, especially after broken in, good way to **** off your neighboors and get the cops attention, some people love that. Yoshis by comparison start relatively quiet till they break in then are decently loud, especially if you remove their silencers. Sound quality is only one aspect of your consideration, volume is the second, and no less important. Also, pitch, you want growly or whiny. There are a ton of different sounds, you really need to listen to a few to be able to tell which ones you like, it's a personal opinion and we'll all have one, won't necessarily match yours.

 

Oh and as for rejetting, your f3 is carbed so it wouldn't be a bad idea, but not 100% necessary. A slipon seems to affect carbed bikes more than injected ones, tho even the injected ones could usually use fuel remapping after a pipe is added, hence the popularity of pcIII's. I'd say go ahead and add a slipon, if it runs rough after and your not happy with it consider getting it jetted then.