I'm also not sure what the differences are; they look functionally the same to me.
My opinion (and it is just my opinion): fancy SS fermenters with 16 different triclamp ports for everything under the sun are overkill for homebrewing. (I realize the ones above aren't quite that, but are on the way)
In my time, I've thrown out exactly one plastic fermenter because it started getting a little hazy and I wanted to be cautious... I was still using it and never had an infected batch. I'm just careful when cleaning to not scratch the interior of them, and never had a single problem.
For temp probe, I tape it on the outside underneath a kitchen sponge for insulation. I've looked at this method directly compared with a second probe in a thermowell in the center of the beer, and I get the same readings at all times during active fermentation. The beer is moving plenty enough to distribute the heat when it matters.
If I'm doing a beer that needs to be in a pressure capable fermenter for either fermenting under pressure, or cold crashing, etc, I use the Fermentasaurus snub nose.
-$100
-Can hold more pressure than you'll ever need
-Floating dip tube
-9gal capacity, you'll never have to worry about a blowoff
-Only one seal around the top to worry about (plus the ball lock post seals)
-Zero lower/submerged ports to leak/clean/worry about
For any beer that isn't super oxygen sensitive and/or doesn't need pressure, I still use Big Mouth Bubbler bucket style fermenters and see zero reason at this time that I'll ever change.
Of course YMMV and there are many valid ways to get it done.