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Well, dervish has full Bab, vs med Bab of Swordsage, then there is the increased move speed, full attacks without other dips, extra attacks from dance/thousand cuts, free spring attack feat, cleave and great cleave. Then there is also fluff.
I apologize if I'm wrong, but isn't Dervish all about two weapon fighting? If that's the case, why are you THFing?
Not strictly. It is true that TWF can work quite well with the dervish, but the only actual ability that backs this up is the one that allows a dervish to treat a scimitar as a light weapon, which works just as well for allowing them to use Weapon Finesse with it as it does for TWF with them.
Also of note, however: TWF with a swordsage is almost as awesome as TWF with a Rogue, more so when Inferno Blade, Raging Mongoose and Time Stands still can come online.
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The biggest problem with the Dervish are the entry requirements. If you can swing those, it can be alright. It doesn't advance maneuvers, granted, but it does gain numerical advantages for what that's worth, and full attack + movement earlier and less conditionally than straight Swordsage does (granted, with Strikes you don't really need it as much).
But yeah, Dervish has higher To Hit, AC, Move Speed and perhaps damage too, if using appropriate Boosts, than a straight Swordsage for a while but you need to invest 4 feats 3 of which are relatively useless, and it's a hefty level investment (especially since you want ~7 levels in Dervish just to gain sufficient number of uses of Dervish Dance to last you an average adventuring day). Straight Swordsage is stronger but SS/Dervish isn't terrible though it does give more to a TWF build than a THF build (especially since THF build probably wants to be using charges to a degree anyways and those are mutually exclusive with Dervish Dance).