I prefer slab for the same reason. It's easier to clean. I was raised by a mom who was always modern/contemporary. She could immediately point to ANY piece of furniture and tell you how much time would be wasted on dusting/cleaning. Shaker would be as far as it goes and never, ever white in the kitchen lol. I lean toward modern/contemporary. I think that has a lot to do with preferring slab cabinets. However, as an artist and someone tuned into aesthetics with literally EVERYTHING, I think it also depends on the amount of cabinets and whether they will be in an open vs enclosed space. The more ornate, the bigger the space should be I would think. And for a super clean look not only slab fronts but drawers instead of cabinets for which I'm inclined also. Just be sure to have longer, more visible but varied hardware or suffer a sea of white or almond or wood. I'm seeing more kitchens with mostley drawers and am soooo happy. The convenience of pulling out a 4 ft deep drawer to see ALL of my pots and pans at once. Stand back and scan your home as you walk into or face your kitchen and picture what color, and what pattern. I know what I'd do with a big kitchen. I'd split the difference. I'd do a different color and slab front bottoms with lots of drawers and have shaker uppers. Or if I had a flush wall of cabinets that houses a fridge and ovens. If there are a lot of uppers, make sure some have patterned glass to break it up or just open shelves (dusting always).

Are you doing all drawer bases? Slab/plank drawers are traditional with Shaker doors, or you could do 5-piece drawer fronts on only the deeper ones. GW discussions--all drawer bases GW discussions--slab drawers with Shaker doors

I did flat panel on all of the narrow top drawers and shaker on the larger bottom two drawers; my stacks were a uniform 3 drawers. I preferred the look of the centered handle on the flat narrow drawer over the centered handle on a narrow shaker.one. I think all three options/combos come down to personal preference.

Shaker and slab doors are both great options for a timeless design! Slab doors will typically be easier to maintain so for longevity concerning the integrity of the design, slab would be the recommendation. Best of luck with your project!