I've never tried a Ammit 25 or a Zeus.
But I picked up an Intake awhile back and have been using it on a regular basis since then. It's pretty nice over all. The flavor on it is good, with a beefy coil it's about equal to a standard side-AF RDA. My biggest complain about it is your drip tip options are limited since the tip sits on a raised 'platform', so any replacements will have to be pretty narrow. Luckily I enjoy both drip tips that came with it. I personally think the looks of the Intake are damn sexy too, especially the gunmetal.
If you're looking for the best flavor possible out of a top-AF, single coil RTA, I'd suggest the Advken TF CP RTA. I picked one up for like $8 and was totally blown away by it's performance in the flavor. It has a host of other issues though: it's a complete pain to fill (despite having a slide-fill top), AF adjustment is nearly useless until the last 3/4 of its adjustment range, and a few other little points. But damn, that flavor tho...
The Intake is probably the better, all-around tank tho. Unless you're only after flavor.