>>1824824>SoraBarely functional low end groupset that will shit itself fast and will shift very slowly and not at all when under load, also heavy as shit and needs constant adjustment
>TiagraGood beginner's groupset to see if you like roadbiking or not, will shift quite slowly and not that well under load but it'll work just fine if you're starting out and just training
>105 (non Di2 version)Not the best, not the worst. Shifts fast enough and under load when doing anything besides real racing. If you're not a beginner anymore and decide that you won't be racing then that is good enough.
> Ultegra Di2Shifts very well and even under load, you don't need to adjust your gears basically almost at all and it stays in place because of Di2. It's something you need when you start out with racing and it'll be good enough until you really start to get to the top.
>Dura-AceJust like Ultegra, but slightly lighter for top tier racing, really expensive to replace parts if something breaks or needs replacment, so it's only really necessary if you're racing on the top level or want to impress people.
As for brakes, get 105 if possible.
