This thing is like latias mixed with flygon, except with BADASS 3 heads. the real question to me is, which will win out, sazando or latias, as I think they are extremely comparable. I'll list all the differences that are immediately seen, and hopefully you guys can provide some input:
Typing: The big difference is that Sazando is weak to fighting (latias resists) and latias is weak to ghost/dark which sazando resists. Because sazando resists pursuit, it escapes what could be thought of as latias's biggest weak point.
Movepool: They both have broad and similar movepools, but sazando gets access to U-turn, Taunt, Focus Blast, Cheer up, Torment, and the REAL flamethrower (doesn't have to resort to hp fire). He also has a solid 105 attack (which is better than flygons) and a solid physical movepool, including outrage, earthquake, stone edge, crunch, and dragon tail.
Latias gets Calm Mind, Recover (most important), Thunderbolt, Ice Beam, Grass Knot, and Trick.
Stats: Sazando has a solid 15 points higher Special Attack (and we thought latias's draco meteors hurt) and a usable 105 Attack over Latias's 80, allowing him to go mixed with outrage, u-turn and earthquake.
Latias, on the other hand, has a deal-breakingly higher 110 Speed, whereas Sazando has a horrible 98 speed, just short of the 100 tier and genosect. Latias also has a far superior special defense, allowing it to switch in on resisted special fire, water, electric, and fighting moves, with sazando just can't handle with its average defenses.