Really depends on what an upgrade means, too. A second round of enhancements, bumping stats, releasing a new version of an existing unit, even something silly and unique like giving some 3 or 4* unit a 7* version. It could be any of those, or even something else. I think that option is far too much of a gamble since they'd follow up with a new vote to determine the unit to be upgraded. The chances the unit you want gets this upgrade are pretty slim.
I really don't like option two because it's ambiguous. What is an STMR moogle? 5%? 50%? Without the specifics, it's possible we take option three for everyone getting an STMR, where as option two may result in a lot of people getting multiple STMRs and TMRs, but some get all TMRs or something. I really hoped they would have learned to be more specific in these with what happened last year. We've got round 2 in August at least, hopefully we get some more goodies from it.