If money is not an issue I would look at what you're trying to grow and the size tank you have. For example if you have a 4ft tank don't expect one kessil ap700 to grow sps. I think radions are more proven for sps dominant tanks.
The shimmer is pretty exaggerated, some like it some don't, but I have found that the ap700 is slightly less exaggerated than the 360's due to having 2 sources as opposed to one.
If you're not looking to grow sps or not sps dominated at least, then it's a toss up of your personal preference.
As noted before, the thing I like about kessils is you don't have to worry about spectrum. I am a kessil ap700 user but if I could do it again on my tank I would have gone 2 radions for the sps, but I would only choose between the preset color options. I don't believe I, or anyone else in this hobby, is smarter than the pre programmed color options to choose their own that are both functional and appease the eye.
Hope this helps in your decision!
Edit: someone also mentioned reducing surface agitation to reduce shimmer on kessils. While this is definitely true, I've found it pretty difficult to reduce surface agitation while also getting adequate circulation. My opinion is this: if you will really be unhappy with the shimmer, go with the radions instead of trying to tweak the flow the get the right shimmer. It's just too difficult IMO.
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