Build it. Hands down. Nothing more rewarding. Look at what everyone says "BUY COMPLETE". But look at what everyone does "BUILT MY OWN". Why because its YOUR CREATION. its real. you know exactly what is in it, and exactly what it can do. and everything will be adjusted to best possible degree.

If you are already thinking about it you're gonna do it anyway. Get it out of your system now (that its cheap), rather than later (when you know more and want to build the "best" road bike ever!)

Dowsides are: if its your first time you will have some self doubt, and wonder if you got it right or this is adjusted properly or not.

It costs a little more.

you want it done fast, but you have to wait.