All good advice. Small is best.

If this is your first bike then invest in on and off-road training, and good gear before your bike.

There is no one bike that does everything well. The ones you mentioned will do some things well and others not so much.

For off-road you want something light. After you have picked your bike up more than three times you will be exhausted and fall off more.

Also, realistically your tyre choice will dictate what you can do. You can't ride offroad on road tyres (certainly not as a novice). Offroad tyres will wear out faster when road riding. So you should consider spare wheels with offroad tyres for offroading if you can't get two bikes. It faster and easier to change whole wheels than tyres.

I have the F650GS and anything around the engine is a pain to work on, I have to strip lots of panelling off to get access to anything. It's not complicated but does take time and everything requires 10" multijointed, pencil-thin fingers to get access (At the moment I am well peed off because I can't take the clutch cover off at all because there is a big metal oil pipe holding it in, and that is just for starters...)

Hey but it is a good all rounder. Super commuter bike, OK for touring (a bit underpowered and little weather protection) and a bit heavy for off road!

My recommendation would be for 250 to 400cc range. The DRZ400 is a super 'little' bike.

Enjoy