I have no experience with the Pardner myself. The Maverick more or less just a slightly tweaked Mossberg 500, which I've shot a good bit (well, kinda - my brother used to have one rebranded as a JC Higgins that we both shot a lot of, but despite the name it was still made by Mossberg just like the ones carrying their own name). It pointed and shot well. The only "gotcha" was that if you short stroked it, it would throw the next round out the bottom onto the ground. Its something you could avoid with practice, but still a headache if you got lax.
With that said, I've whittled my shotgun collection down to 3 guns as of late, and the only pump I've kept is a Remington 870 Express. If you can put some extra money towards one, I really don't think there's a better pump shotgun made. My father has been shooting his 870 Wingmaster (and I mean really, REALLY shooting it - I'd shudder to think how many rounds have been through that gun) for around 40 years now - it's still going strong. They'll last you for as long as you want to stick with a pump.
If you truly can't afford to get the real 870, then as I said I have no experience first-hand with the Pardner, but if it's as close in design to the 870 as everyone says then I'd put my money on that one.
Lots of used 870's or Mossberg 500's selling used for that price. You'll be better off in the long run.
And that's the truth there. Not sure how it is in other parts of the country, but most pawn shops around here are overlowing with shotguns (If I had to guess I'd say that shotguns comprise around 80% of the firearms inventory in the pawn shops around here). You can EASILY find used Rem 870's or Mossberg 500's for under $200. Heck if you're looking for utility and not looks it's not uncommon to find a perfectly serviceable but cosmetically worn example for more like $125.