Sendero are the knobblier ones, right? I looked at those, too. For 2 reasons I disregard them:
My rides are mixed and prefer a bit of smothness for the tarmac part. With Senderos I was a bit concerned about the extra drag as I am not a strong pedaler and any drag on flat roads kind of annoys me.
Read a review about its real size and was saying that while in general is around 47 at the side knobbs are going somewhere between 48-49mm. And if you chainstay spacinf is similar to my sketch than the risk of rubb, I imagine, is semnificative.
When I chose the Venture I considered that would give a good balance for my need. Already discovered compared to 700cx35 on some areas, on climbing rocky places, it behaves way better. I have to test it against some rougher wet downhills where I had to get off the bike with the 700c. The downhills are nothing spectacular, just larger looser rocks kind of the size of a fist.
I am still at the beginning with the offroad things and on youtube seen some guys doing some pretty intense things with the gravel bike on MTB trails. I know so far that I still have to accustome my self with going downhill on the hoods. I feel a lot of pressure on my palms. Have inline breaks, but for heavier stuff the decrease in levearage length makes it impractical to control the bike. Must look at one point for some 50+ drops(if they exist) and decrease the stem length.
As for you trying the Sendero you can do what I did. :)). I took a plundge after 3 month of research and going back and forth about the 650bx47 wheels.