If you're interested in MX/Enduro bikes, I would recommend the latter as you'll likely find them more versatile (Enduro bikes can be road registered so allow for green laining opportunities)
I have a drz400 as a run around, I took it to a Mx track where a mate was riding a cr250, if your not looking to take it on the road the cr250 is much faster, lighter and tougher than the drz.
As a off road bike I would seriously recommend a cr250
Look out for a Maico 490, it'll pull your arms out. I believe you can still pick these up? I saw a guy tear up a track with one of these things, and I mean 'tear up' sensational [emoji106]
PS that was in 1983!