I've been running the 700c Riddlers for a few weeks and have been pretty happy overall. My only real complaint is that they seem a bit fragile having already plugged them a couple of times. I'm riding on slightly rougher terrain than what they're probably designed for; primarily 4WD tracks rather than 'gravel roads'. Borderline MTB to be honest but typical bikepacking which will invariably cover 'mixed terrain' of road / gravel / rough track so keen to stay on the gravel bike :-)
I'm keen to know how they compare to the Resolutes for those that have used both. Although they are considerably lighter (and a tad narrower), they Resolutes look like they'd be happier on dirt where they need to bite in a bit (light mud, sand etc.) How do they fare compare to the Riddlers overall? I read some reviews saying the Riddlers are more 'hard core' and others that say the opposite. I'm guessing the larger squared profile of the Resolutes would improve braking in gravel... any other traits I should be aware of? Also, other tires from other manufactures you might recommend?
I can't speak to the Riddlers, however I put about 2500 miles on some Resolutes and loved them. I didn't have a single flat until I had to replace the rear at about 2400 miles with a huge gash. I live out in WV and we have some pretty gnarly gravel "roads" out here. Also took them on some singletrack and they performed flawlessly. The last thing I'll say about the Resolutes is how fast they roll, especially on tarmac. I think you'd be hard pressed to find a better performing do it all gravel tire. I wanted to throw them on my Hakka but they were too tall, coming within an millimeter of rubbing on the bottom bracket, so I settled for the 40mm WTB Nano.
I've never tried the Resolutes, but another option, if your rims are wide enough, is the WTB 29" Ranger. It comes in a 2" wide version. I use the 2.25" on my Fargo for bikepacking and they're great. They're solid on gravel, logging roads, 4x4, etc. and they're also fairly fast rolling on hard surfaces. Just an idea.