The 8v donkey in the 33 is (no surprise?) a really great engine.
It's a different kettle of fish to the 16v.. it has noticeably more torque lower in the rev range (from memory I think the 16v only matches and then beats the torque of the 8v from 4000rpm on) so it is very
smooth to drive. The 8v boxer engine is one of the smoothest that anyone ever built.
Also the 8v normally comes in the "Lusso" spec' whereas the 16v ("Boxer" and QV spec's) had firmer suspension and thinner seats... so 8v is actually quite a comfortable car for cruising. It also has no cat' (pre-1992?) and is a lot less complicated.. though changing the spark plugs is a 1-day job!
That said, as a daily driver the '45 is the one to have.. it's got a more powerful engine and the brakes are a lot more modern (33 brakes started life on a 1.3...
) It's just newer and more conventional so it's easier to work on too.
You can get parts for the '45 in more or less just a few days... For the 33 now, you need weeks to find any pieces, if they even exist.
But if you can find a mint 33, you have a little space in your garage and you don't need it to be operational 24/7 day in, day out... it's still a fine car to own before they all eventually fade away.. so try to try one if there's any way you can..