there is nothing wrong with Splits, however, I DO NOT RECOMMEND ATOMICS. I had a pair, stupid things lasted about 13 months and the panels started falling out. If you are dead set on splits get the Apollo Bio-Fin, the one piece construction is much more durable and the foot pocket is more comfortable. Every review of them shows they are a match for performance with the Atomic, so go for durability.
to answer your question about easier to kick, well yes and no.
Yes- you will have less load on your muscles and joints
No- you have to kick at a high rate to go anywhere quickly
its similar to gearing on a bike, big muscles can turn big gears slowly to climb a hill, but fast muscles can spin lower gears and get up the hill just as quickly. the question for you, is which type of kick do you have?
The problem with splits in currents is, even though they are normally faster in a sprint, that few people have the physical fitness to sustain such a high rate of kick and they tire quickly, but then the same people don't have the strength to overcome a current with any fin either, but they blame splits for their lack of skill and training.
Splits DO NOT manuever as well as paddles, and they don't frog kick, or scull as well either. but they do flutter kick better and at a lower workload, but you have to make up for it with higher kick rates. They are not for everyone, but for many, whom dive exclusively in warm, clear water, a couple of times a year within the recreational limits, they are fine.