Electric.
At work we got 3 packs free of Knucklehead strings. They gave them to me because they don't like them, I got the 9s, 10s, and Customs. I don't think played on 9s since I got my first guitar 5 years ago. So I fear I may bend those out of tune. I normally bounce between 10s and 11s.
Edit: Forgot to add this. Make sure you have Tremolo springs in the back for tension or it will mess up the intonation. 11s NEED at least 4 springs and 13s on up need at least 5. I have 4 currently, and pending on the make of your guitar, you may have to do some unsoldering. My first guitar has weird solder points and it's right where the springs would go. Just check that out. Also, 13s on up will no allow you to play well in standard, you will have to be tuned down at least somewhat.
