What does this mean?

The EX-10 Helios offers Advanced HSR and compares it to the Mars R system by asserting it is 30% faster.
http://www.kopropo.com/EX-10_helios.htm

The Futaba T3PK offers HRS (High Response Mode) and compares it to all radios as twice the speed.
http://www.futaba-rc.com/radios/futj32.html

Myself, I own both the JR XS3 (mbX5) and Futaba T3PK (most everything else I own). I've also tried the EX-10 but it felt bottom heavy to me though I did like the optional multi-angle wheel extension. However, I should and have thought about converting everything I own to the Futaba T3PK simple because I like that way that radio feels and since I use that radio the most--the brake mix is also nice for 1/5th scale cars using both front and rear brakes. The T3PK is now also available with a synthasized module.

I suggest trying each radio and picking the one that feels the best.