Either is fine, I would try and look further ahead assuming you are planning keeping hold of it for a while. I had a nice offer of a really well kitted up 110 station wagon which I didn't take. I subsequently bought a nice hard top 300TDi 110 which I've had for about 10 years and driven round Aus, trans africa etc. The hardtop has been brilliant for my wife and I but is harder to use with a growing family. In the overall picture, I would probably have been better off with the station wagon.

Pros of hardtop are easier to configure back, we actually have more leg room on the second row of seats than a station wagon would give because we have mounted them further back, better security for stuff in back if behind a cargo barrier - could achieve the same in the back section of a station wagon but only covers the rear third as apposed to all of the back.

Con is harder to access. This may be quite significant if you are planning putting a platform to sleep in in the back as if you have a station wagon, you can still use the side doors to access the areas under the platform towards the front where as if you only have a hard top, its much harder to get at all the space underneath - depends what you want to put underneath and how much access you will need to it.

with the benefit of hindsight, I would probably get a station wagon for the immediate needs and for the longer term flexibility.