Zen vs remix
I paddle a zen 75 and demoed a remix 79 prior to settling on the zen. I use the zen primarily on class 4-5 big water/steep river stuff. I'm 6' 170.
I would say at least half of the people I boat with paddle remixes, very popular idaho boat. It felt like it might have gotten up to speed a little quicker then the zen, but similar speed over all. Punches holes well, felt like it might ride a little higher, more stable then the zen at my weight. Lack of edges meant having to pay a bit more attention on peel outs and ferries, but might be a bit more forgiving. Surfs ok. Outfitting is comfortable, and solid. In hindsight I probably should have tried the 69. I felt to loose in the 79 and would of had to spend some time adding foam to get a tight fit. I'm sure I could paddle one of these and be perfectly happy with it. Probably a better choice if you see your self creeking in the future, displacement hull will be a bit more forgiving.
The zen feels very similar, but with a few differences that sold me. The 75 fits me like a glove, and feels a bit smaller, even though it's advertised as being the same size as the 79. Lower knee position makes it feel very responsive. Really like how snappy the edges are. Planning hull surfs well on big green waves, edges are also nice for trying to get out of big holes during unintentional rides.. The outfitting is one thing that really sold me. The bulkhead is super easy to remove and pack gear in front of for overnighters. It's also saved me some ankle pain after a hard piton. Plastic seems great, had a big dent in the nose after piton, popped out on its own after a few hours in the sun. The rest of the outfitting is very simple and light, but seems durable. Overall the boat is considerable lighter then most other similar boat. Both of these boats take a fair amount of effort to boof, and are not a nimble as a creeker, but you get used to it.
If your looking for a river runner for class 3-4 type stuff that can play a little I would go with the zen. If you have intentions of running harder stuff the remix might make a little more sense. Demo if you can, but I don't think you could go wrong with either.