Personally I don't think it matters. Just make sure that it either has a balancer built in, or so as I did and get a separate balancer.
Only other thing that springs to mind is that it can charge at 1C - if your lipo's are 4200mah make sure it can charge at 4.2amps...
As with most things in this hobby alot of people seem to spend substantially more than is needed (I know I have on a few things). eBay is a good place to look - post a link before you buy and someone will tell you yay or nay!
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