...as I think I said above, the in-frame batteries look quite neat, but they tend to be proprietary, so on the off-chance you want a spare battery or need a replacement, your choice is limited. A standard external Bosch battery, however, is widely obtainable.
I have both hub and derailleur gears on my two e-Bikes. Swings and roundabouts with the advantages of each being much the same as for ordinary bikes (though I haven't tried the hub gears where the motor is disabled momentarily when you change gear, that might be quite nice). I do find, with the derailleur, that I have to be somewhat more predictive with down-changes on uphill stretches, as the torque maintained by the drive can make things a bit more tricky.
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