Neither. Buy the very best d2 you can find, try and find a late pre-facelift, sort every single problem it has, fully service it, put 5 new tyres on it, buy a nanocom, weld a new rear chassis in, rust proof it, fix the ace and air suspension, have money left for adventures.
D3 - as you've already mentioned is quite possibly a money pit.
110 - again, a target for thieves, not particularly comfortable. Perhaps not everyone's idea of a family car.
D2 - nobody will really notice it, pretty refined, fairly reliable.
That's what I'd do anyway but I've never owned a d2 or d3, and despite owning a 110, never driven one! Also, depends heavily on what work you can carry out on the vehicle yourself.
Just what I'd do if I had a 10k budget to spend on one car with that sort of use in mind.
This is what I would probably do, too, given your intended use. If you don't need the 110, then don't have it. IMHO, D2 is a much better vehicle for your proposed use. As above, though, make sure you get a nanocom for the inevitable electronic gremlins.