The FTM 400 has 2 buttons about 0.5" and 2 about 0.75 [slightly less]. 710 has 1 about 0.5' and 2 about 0.75". I prefer the Yaesu mic especially for long QSOs as easier to hold and easier to keep PTT pressed but that is my preference. I also like Yaesu mic as it will perform most functions of the radio and can change them to suit ones use. I've own numerous Yaesu radios including FT8900 for 20 years with no mic problems. But of course peoples mileage vary. Have not had any final failures on old 400 or newer. The 710 mic has a limited number of radio functions. The 710 has a better APRS/TNC functionality of which I seldom use. It is easier to output to computer for plotting APRS positions. I find programming Yaesu much easier than Kenwood but that is because I have used Yaesu radios longer. One has to determine just what you want from a radio and how to use it. I really can't recommend one over the other.