When searching to buy a civic a handful of years ago, I looked at the del sol - I love it, however realistically I was thinking about the drives Id be making between home and school - 500 miles away. I went with the coupe for practical reasons - I can hual stuff, and people if I need to. With the delsol you'd be SOL if you needed to carry a friend, or haul anything at all.

If you have another vehical at your disposal, get the delsol, if your civic will be your only car, then get the coupe.

other than that, they should be as reliable and tunable as each other.