Generally the older ones. There's a good site called Scalemates that usually has a pretty accurate timeline of a kit. They'll indicate when the kit was originally issued, and when it was either reboxed, retooled, or distributed under another brand name.
There's been plenty of discussion about this subject. There's a concensus that recessed is better than raised, but I personally would qualify that. Some old kits have recessed lines that are a scale inch or so wide.
A lot has to do with scale, too. If 1/72 is your preference, there really aren't panel lines in the surface. That means either filling them in or sanding them off. The latter is much easier.
At larger scales, raised lines become more apparently incorrect as the scale gets larger, while recessed ones get smaller and therefore less apparent.
Most aircraft, esp. anything WW2 or more recent, don't really have physical panel lines that have any dimension to them.
Rescribing is something best left for when you've advanced your skills (I'm not up to it).
It's pretty easy to put a lot of time into something that would have looked better if you hadn't bothered.