The cheapest of the 3 is the Mossberg Maverick 88 - a Mossberg 500 w/ a crossbolt safety instead of the 500's tang safety, and it's not drilled & tapped for a scope mount. My local chain sells it for $190.
Remington 870 Express is a steel receiver, crossbolt safety, built since the 50's. Wingmasters are the pretty blued guns, those & the Police models have higher quality internals, but everything can be swapped out in the Express. Express sells for $290 new, widely available used. New ones have the Liberal anti-gun rotary lock in the crossbolt safety, which can be replaced.
500 is aluminum receiver, tang safety instead of 88's crossbolt, new ones tapped for scope mount. Brand new ones have "Flex" stock removal, very easy to switch to PG, folding stock, AR collapsible, etc. May run a bit higher than 870 Express.
My 870 20 ga didn't like Remington ammo, runs fine on Winchesters. Go figure. If any of the above have problems, they're easily resolved by replacing parts or sending back to manufacturer. Both designs are more than 40 years old.