I kinda think the imperials "won" on commander options. Each one has a rebel "mirror" that does similar things, but in a less impressive way (i feel).
Dodonna is great for fishing for those crits that have an immediate effect and can't be engineered away. If he didn't let fighters do that too (and asteroids?) he probably wouldn't be worth it. I'd rather have screed's consistent crits for my overload pulses. Especially since if you want to use any of the fancy crits (apart from XX-9's and the 'vette named after him), you're forfeiting Dodonna's ability.
Garm is the generic brand version of tarkin, crappier effect but for 10 points cheaper. Will say you can at least customise the tokens Garm gives. Of course, the only things my friends use their tarkin-tokens for are engineering or sacrifices to the weapons liason, so they don't really care that much about what kind they give their ships.
Mothma is great if you're running small ships, since every rebel ship so far has at least one evade token. Motti's upgrade is not dependent on maneuver to matter and he's cheaper.