[Hilltopperny]

I will chime in as I have used both. I live in the southern Adirondack foothills and have run both Sram 1x and Shimano 2x on different gravel bikes.

My 2x set up is 52/36 with an 11-40 in the rear never let me down on the road or gravel/dirt. There are plenty of hills, rolling terrain and descents that this kind of gearing will comfortably allow me to ride without ever feeling under or over geared. The biggest detriments are in my opinion the chain slap in certain gears and the gear spacing, but I like it over the 1x systems I have used.

I have used both force and rival 1x groups and they function great. They are also great for climbing as I ran them with everything from 42t-34t oval up front and an 11-40 in the rear. The simplicity is nice, but I did end up spinning it out quite a bit. It is excellent if you are predominantly riding dirt/gravel, but lacked top end on the asphalt on descents and sometimes the flats.

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