The Vittora gravel tires are slower than the specs read. They have a heavier casing/sidewall than the competitors. I'd do the Corsa Control over the gravel tires. I'd do a road tire in general unless you have sharp rocks or thorns. I've had good luck with G-One Speed 30c. Another good option with a Challenge Strada Bianci
Unfortunately, this size is still kinds useless on ungroomed dirts, hard packs, and anything with a deformable surface. Forget touching any wet surface. They're fine on proper dirt roads or an excellent trail with a skim of gravel/sand. I wouldn't bother with any knobs - slicks or light tread design only. The problem is that you still need to run these at 60+ psi, so that's not conducive to planned dirt excursions. Running the tires at CX tires pressures is not conducive to road speeds, CX tires are made to cut through mud, and are only that size because the rules require it. If you want both, you need to be on 35c+ tires, ideally around 40c@ 35-40psi to be fast even smooth trails and loose aggregate gravel .Tubeless is the only way to fly here, so you can the the pressure lower. See if you can borrow a 35c tire from someone and if you still have 3mm of clearance on each side (like rear is the issue, or fork crown).
Roadbike.de did a nice roller test of gravel tires
https://www.roadbike.de/rennrad-part...eifen-im-test/ and Bicycle rolling resistance did a test of the same tire in various sizes.
Notes before reading these numbers:
-the g-one speed was the heavy duty 100kg build, not the lighter 70kg casing build - the lighter duty build should come in around 18-20w on this test at the same pressure.
-the g-one speed was at 3.5bar 50psi, which is too low for that size
-The road tire was at 100psi and did 17.1 w at 60psi
From this we can infer with the help of BRR's test that on a similar test on a top end tire:
TT tire @ 100psi - ~10.5w
Top End Road (Pro One TLE) @ 100psi - ~13.5w
High End Road (One TL) @ 100psi - 14.5w
High End Road (One TL) @ 60psi - 17W
Fat road / Skinny gravel (G-one Speed 30-35c w/ road casing) @ 60psi ~ 19W
40C Highend Tire (G-One AllA) @ 50psi - 21.3w
In general:
Gravel knobs only add 1-2w
Heartier sidewalls add 2-3w
Lower pressures cost 3-4w
Thicker primary rubber costs 3w (TT -> everyday use)
A tube costs 1w (race latex) - 3w (std); TL goo costs ~2.5w