Outside pulling spokes lacing adds a little life...iinside pulling adds a little faster response time to power input...

...but here's the catch...

...it's a difference that only someone like Lance Armstrong might notice - and I doubt he would really give a damn longevity-wise as his wheels are probably tossed every 1000 miles or so anyway...it's like the difference between .001 and .002. Don't lose sleep over it...

1. Use mirror lacing.
2. Pick outside or inside for new wheels...whatever turns you on.
3. For rebuilds try to go with what was done before - at least make sure that pulling spokes go back into holes used for pulling spokes before.

=8-)