For the 700, I recommend the lightest tire that will serve your needs. I have zillas and they work great for me in mainly mud and sand trails... Also the lightest I could find. 27”.... On the gravel road they work great as far as I can tell. Cheap too. If you want a radial, Bear claw htr is great. Also bighorn 2.0. Both are lighter than most. Also gbc dirt commander is my favorite right now. Check those out then report back and let me know if you want more aggressive and I will recommend a few more...
Every thing William said plus mudlites 2 radials , out back AT , or for a really tough tire STI black water evos . The are pretty light and excellent tires.
think the black water is itp, there is also sti black diamond xtr, the guy in my club that has those goes through every thing I do and got stuck same hole I did with the mud lights. those have a lot of great reviews for rocks and gravel