Snapper rider or walk-behind for back-up?

[Lawnworks]

I have an Encore Z48 as my main mower, but I want another mower to replace my Snapper Yard Cruiser 42&quot;/15hp. It goes 6.5 mph like most walk-behinds. I am thinking of selling it and getting a walk-behind. Should I get an Exmark Metro or buy a used mower with low hours or should I just keep the Snapper?<p>Thanks<br>Rick