I like the first one (The Blue one). -More power, nicer, cheaper, voltmeter, etc.
Remember you can also use this as an (incandescent) light dimmer, soldering iron controller, etc.
Either input voltage is fine.
Either unit is more than than you need WRT power, but fine for sure.
(Look at the amps capacity -you only need >1A) Bigger won't hurt and could be more useful for "other" projects.
These are (nearly) silent. There may be a very slight 60 Hz buzz.
Avoid over-volting your motor (you will have this capability). You won't gain anything.
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Jack of all Trades, Master of None.
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