I use a couple different types of rakes, but I have to say the best one of them, as far as getting every last bit of hay, is the old IH 4 bar rake.
It's slow of course, but I love using it in small fields when time isn't a big factor. It's also finicky, you've got to keep all those stripper bars aligned. But when it's set up right, it runs so quietly and does a great job.
It scours the ground.
I'd have to think just because your rake is old doesn't mean it can't work well. Might just need to be adjusted properly - and used properly. A lot of those old rakes were designed to be pulled by horses, and some had an optional gear to use when pulled by a tractor.
You don't mention the type of rake.