If both have 0 minute waits I'll go with TSMM. If both have comparable waits, still TSMM. Five minutes for Buzz but thirty for TSMM? Buzz every time. Now, if we're talking about Disneyland Buzz its a different story. DL Buzz > TSMM > WDW Buzz.
I still love WDW Buzz, it's one of my favorite rides, but its in absolutely horrible shape. Beyond the issues with the lasers I've have at least half of my recent ride throughs screwed by one or both lasers not working, spinning not working, effects not working, etc. I once lost while riding solo because the gun I didn't use somehow got a million points.