Rotor.
Even if you need to save the £50 price difference to pay for paint/training you'll spend that in batteries during the life of whichever other loader you buy.
Got a Rotor 2 years ago and it still has the same set of batteries sat in it (hasn't seen THAT much action, but if you leave batteries in any other loader I've owned they are useless within a month).
^ This.
The rotor only needs 3 AA batteries. Ive used the same batteries all season, every round @ CPPS plus 4 rounds @ Masters, and training days. Even thou the batteries were still working fine, i changed out for new ones last round CPPS, just to be 100% sure.
When i use to use VLocity loaders a few years back, i had to swop out new batteries every month.
Both loaders are very reliable with paint. If you intend playing with reballs, the rotor does jam often, whereas the VLocity has no problems.
The rotor's shell is more robust IMO, and very easy and tooless to take apart, which can be done so within seconds.
Work out figures and convienience of them both, and make your own mind which you prefer
