Both are excellent starter knives. I carried a Vapor II as a beater for about a year, but it developed a LOT of blade play in all directions.
At the time, the only other frame lock I owned was a Sebenza, and side by side, out of the box the Vapor locked up as well as the Sebbie. Even with it's absurd amounts of blade play (it rattled when in the open position) the lock was never compromised.
I called Kershaw about washers and they sent, free of charge, entirely new fittings for the knife (pivot, handle screws, washers, clip screws and a new clip). That experience made me a Kershaw fan and my rebuilt Vapor is as good as new.
That said, the Byrds I've handled were tanks, but I've only handled, I don't own one. I think they'd make a wonderful entry level knife that'll take some abuse. The Meadowlark looks like it would make a mighty fine beater and you can't beat the price of those knives.
I don't know if you're interested or not, but another good entry level knife would be a Benchmade Pika. Not one that I own, but a friend has the big one and I've played with the little one before and they seem like good sturdy knives for a great price.