A4 or M6? All three of those tunes will be the same tune for an M6. Not sure about the A4 tune though(I'm an M6 guy and have never done any research into the A4 portion of tuning).
Max power will be tuned in PE mode for optimum performance at WOT, which shouldn't be leaned out for any other reason. And if you want maximum gas mileage while cruising, you can command a slightly leaner AFR, but when would you want a "daily driver" tune that isn't for fuel economy?
IMHO, one good tune is all you need. If you do go with a slightly leaner AFR emissions will be impacted. Therefore if you need to pass an emissions test, that would be the only other tune I'd have (if your normal tune won't pass).
1995 Firehawk #528 resto-mod underway
Planned 383 rebuild: 195cc competition LT4 AFR heads, custom cam grind (still debating specs), 6" or 5.85" rods, forged internals
Upgraded T56: Viper mainshaft and 2nd gear, steel 3/4 shift fork, Billet keys 1-4, bronze shifter cup, internals Cryo'd and REM'd