This issue comes up frequently in our world of riders. Cross and gravel are really two different uses with different needs. I don't run tubulars in gravel rides. I run either clinchers or more likely tubeless while carrying extra tubes. Tubulars for cross are great if you come back to the start finish every few minutes or have a support crew, otherwise for most of us they aren't practical in rock strewn terrain. If you aren't sure which riding you will do more of, today I would always go clincher tubeless. All I've ever used on a gravel ride is more sealant.