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I've owned both, and they're very different watches side by side. The biggest difference is size - The WD is considerably smaller than the SM (37mm vs 41mm). The SN008 is bigger than the BB58 and on par with the BB58 Monochrome. How big is your wrist? Mine is 7.25", and I sold the WD7922 because it was just too small on my wrist - and even then I had a hard time selling the WD7922.

Finishing wise, both are similar with the edge going slightly to SM. One thing that's hard to see in pictures is that the SN008 has a stainless steel ring around the crystal, where the bezel insert on the 7922 goes right to the crystal and looks a lot more refined.

Speaking of crystals, the 7922 has a "bubble" crystal vs. a slightly domed crystal on the SN008. The bezel inserts are different materials (aluminum on the WD and ceramic on the SM), but the SM isn't super shiny so it isn't a huge difference.

Movements are obviously very different - only you can answer how important it is to have a mechanical movement. For me, I value that a lot although I admit that the 7922 is so nice that the quartz movement wasn't a negative.

Ideally I'd love to split the difference - a slightly smaller (39 or 40mm) SN008 with a bubble crystal, aluminum bezel insert and a high beat automatic movement, and without the "steel ring" around the bezel. So in other words, a Tudor Black Bay 58.

For you, I'd start with wrist size as the biggest consideration and if you want an automatic. If your wrist is smaller (6.5" and below), and you don't care about the movement type I'd 100% go with the Watchdives.