I would say do a trial lesson (or two) in each type and go with what you feel happiest flying.
I started out on flexwing, but went over to 3 axis (and had to put up with some lighthearted abuse from the flexwing pilots for flying a 'girlie plane').
The way I considered it was that at our airfield, the 3 axis planes weren't as popular, so I was more likely to be able to get a lesson or two in when I wanted, and due to their better tolerence of weather conditions I could go and fly when the flexwings were grounded. The other reason is that as the controls are similar to GA, it would be an easier transition to flying something bigger when time and money allowed.
In the meantime, if I fancied a bit of open air, I could just ask a flexwing flying friend to take me for a bimble!