I'm an active gym rpm class attendee and am keen to extend fitness sessions by cycling on the road. I know I want drop handles, shimano sora shifters, and a sportive type geometry. However, I am not used to roads and am wondering how much road riding I actually will do. If I do a lot, an investment in Giant defy 3 would payoff and if I do little, it's second hand value might be ok. However, the smaller outlay for the triban 500 has the advantage of being a lower risk if I do little riding, but will come up short if I do a lot. I had originally thought of a cx bike in case I was chicken on the road and could then go on slightly rougher off-road paths/old railway lines etc.
Any advice please?!?