What smartphone specs should I look at for fast RAW exposure bracketing?

I've narrowed my choice down to (CPU clock speed in parens):

• HTC One A9 (10.8GHz total)


• Samsung S6 (14.4GHz total)


• LG G4 (9.2GHz total)


• Huawei P9 (17.2GHz total)


• Huawei Nexus 6P (14.2GHz total)

My primary concern is that when I use an exp. bracketing app such as Camera FV-5, and shoot RAW, it's gonna take too long to store each exposure and the clouds will have moved too much in the meantime.

To avoid that problem, I'm thinking I should pick the one with the highest CPU clock speed. Or maybe I should pick the one with the fewest megapixels?

Note that, eyeing gsmarena.com sample low-light photos, I prefer the two Huawei phones to the other three.

If all 4 phones would take a really long time (like 5 seconds) per RAW exposure, then maybe I'll drop the "RAW" requirement and look for phones that support a higher bracketing range. E.g. my current Samsung Galaxy J7 (2017) only from -2EV to +2EV, which is too little. But that's gonna be another question.