Primus Trail Knit FG

Personally don't find much difference in the breathability of each, but do find that the all weathers are a little wider and more comfortable (for me)

I have 8 pairs of vivos and have been a Barefoot shoe guy for 15+ years. Here's my two cents.  I love the knit shoes for everyday wear. They look so dang nice. However, they're noticebly narrower in the toe box. Something to keep in mind if you care about that.  Like others have said, the primus lites are thinner soles. I don't run so much, but walk and hike a ton. On longer outings it's nice to have slightly thicker soles. Probably would be even more so in a half marathon.  I know vivo recently came out with a running specific shoe. ive been considering getting more into running and have had my eye on those. Might be worth checking out.  For trails I alternate between the sandals and boots depending on the weather. Before getting those I used the Primus trail knit and they were also great. If I get a new pair then I'd get the regular version for the wider toe box.  I've had my eye on the hydras, but those seem like very specific use case shoes. I don't go in the water enough to justify getting.  I've also had my eye on the gym shoes they make, but I've been content using my oldest pair of Primus lites for working out. I do strength training 4 days a week. 

I think you'll actually like all 3. I have the grey trail knit and they're my all time favorite vivo shoe.

I have a low volume foot and I like the fit on the trail knit. They hug my foot like a nice stretchy sock. I think you'll prefer that. The FG is good, but a little loose and stiff. I really like the ora for the reasons you stated. Its nice getting my feet wet, but I did kick a rock once and that made me sad. Now I'm more hesitant to wear them

I have a low volume foot and I like the fit on the trail knit. They hug my foot like a nice stretchy sock. I think you'll prefer that. The FG is good, but a little loose and stiff. I really like the ora for the reasons you stated. Its nice getting my feet wet, but I did kick a rock once and that made me sad. Now I'm more hesitant to wear them

barefoot shoe user for approx 20 yrs. mainly vivo and fivefingers but also altra, topo, merrell, skinners etc. Always come back for the trail FG. A true swiss army knife. Use in the city but also for running on gravel road and even hiking. For me the primus can be a bit thin for longer walks in the city and the SG sole a bit soft for hiking when rocky. good luck!

have had both, currently the knit, find the knit a bit heavy and less "good looking" but very easy to put on. I would buy the regular and put on stretch laces. as the lawyers say, there is a specialist for every opinion.

just back from a week in Norway. Late spring with more snow melting than normal. As such rather wet and muddy, your leather boots will never dry over night if you do not stay in huts that has a warm "dry room", something not all huts has. The FG might be slippery, the SG sole would be better but with sharp rocks I find it to soft. Altra Lone Peak or similar is something to consider. Of the two you asked about I would go for the FG but no need for allweather as mud and water will enter the shoe anyway, even with gaiters. I rotate merino socks, toe-socks, and Seal Skinz socks. Enjoy!

Primus trail knit is my favorite vivo I've tried. They're the widest ive tried for sure. Just got the Chelsea boot today though and those are feeling pretty wide off the bat.

Yep, about my experience, not tried the all weathers but the knits are a little on the slimmer side compared to my lites and motus

I used them a lot, but it's true that they squeeze the foot quite a bit. As time went by they bothered me a little more for that reason. Otherwise, I didn't have any problems.