The guitarists in my band have both of these tuners...
The Fender tuner is cheaper and works pretty well for guitar. I've tried tuning my bass with it and it has a little trouble finding the notes with that, so if you'll be tuning basses with it any or using some crazy low tuning then it might not be your cup of tea. The biggest shortfall (and
most important one) if you ask me is that it's *hard to read* on stage. It has tiny dots that light up on the face under the note it 'thinks' you're tuning and more tiny dots light up to show you how close you are to "center" (or in tune) of that note. It's just as rugged as the Boss with a metal casing and rubber pad on the portion of the pedal you press on.
The Boss tuner is rugged and practically indestructible. It has been able to help tune any instrument I put through it accurately and quickly. The biggest factor aside from its worldwide use by the pros is that it has a BIG LED panel on it that indicates what note you are tuning and how far from in tune you are. You can use this thing in the dark if you want, but you'll still be able to see. The Fender makes it impossible to do this because all you'd see in the dark is dots and you're unable to tell what note is lit up. It's pretty hard to read from a "standing up" distance as well...like, say, if you're looking down at your pedal board.
Korg also makes a pedal tuner that I just found on the internet (never seen one in person) called the DT-10. It goes for the same price as the Boss and looks just as durable. Looks as if the Boss would take up less space on your pedal board, but it's up to you. Check one out at
http://www.bass-guitar.biz/store/pro...=EM.DT10&nav=m
Stay away from any Danelectro mini pedals, especially the tuner. The mini pedals are all made of plastic and crack easily. Not only that, but they don't sound that great either when it comes to their other mini pedals. The tuner has a liquid crystal display like a calculator...that would make it hard to read on stage. It's no better than getting a $15 to $20 tuner at any music store or any better than the ones they throw in for free with all those packages.