Di2 11 speed or 10 speed upgrade

MCox432

sorry if this has already been covered but the search engine on bikeradar is down for me atm so I cant search anything.

I am currently looking at upgrading my 2013 Giant TCR Advanced 1 to Di2 but I don't know whether I should just upgrade the shifters or fully upgrade to Ultegra 11 speed. If I was to upgrade to 11 speed I would also have to buy a spare set of compatible wheels and 2 youth cassettes but if I was just to upgrade the shifters I wouldn't need any extras.

Please can you give me the pros and cons of each upgrade?

Thanks

Grill

Go 6770 (10 speed). You can get the mechs super cheaper from Rose Bikes at the moment. When you finally decide to take the plunge to 11 speed (wheels being the catalyst) just buy a 6870 rear mech.