The FT-710 scores very highly on the Sherwood tests. I do not think the latest ICOM rig has been tested, although the mark 1 was somewhat lower down. For most people most of the time these numbers are academic.
Both rigs cover up to 70MHz. I know the FT710 can be widebanded without uncasing. I am not sure about the IC7300mk2.
The Yaesu radio is considerably less expensive in the UK and comes with a Yaesu cashback. I think Yaesu offers a 3 year warranty.
I am sure both are good radios.
