I'd say feel them both. I've given up Mossberg for the BPS years ago. I would like to remind you that even on the BPS, the action bar release button will still be on your off-side (left), though much larger and easier to manipulate with your index finger. The trigger, action bars, and safety are much smoother on the BPS. If you want to shoot interchangeable chokes for other reasons, the Browning barrels will go down to 22" with a vent rib--not much longer than the 590. If you switch to magnum loads, you will get some powder fouling residue flung out the side of the Mossberg with quick follow-up shots. There will be none of that with the bottom-eject BPS. After mounting a Redfield scope mount and red dot on mine, I can say it has become an unreplaceable tool for quick death I have come to love for deer, turkey, and HD alike. The decision is personal, and I'm all about personal $$$. The choice is definitely all yours, and good luck.
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