Best thing is to test drive a 4/4 and a +4 (and any other Mogs you can).
I was set on having a +4 until I tried a 4/4 and loved it.
The 4/4 requires more gear changes and revving and that is what I wanted from a classic sports car. Most of the driving I do is on twisting narrow country lanes where high speed is not needed and the 4/4 gives me great fun at 30 - 50 mph.
I opted to have a spare wheel but mainly because I liked the look of it and partly because I drive a lot in areas with no mobile phone signal so feel happier knowing I have the spare. In truth I can only remember changing a tyre once in the last 20 years so I would not be too concerned if I had no spare - many other modern cars have none supplied.
We are all different and Morgans allow a large range of choice so try as many as you can and I'll bet the car chooses you in the end.