hey,
It like intel pentium I; and intel i7..... in computers
pentium 1 is no longer available and nobody wants it......
intel i7 is latest technology and hence expensive.......
i dont know much about the channels implemented
but 72 mhz is easier to use.... (atleast i feel like that..... switch it on and you are ready to go no need to link up
)
ask some senior fliers near by, they can explain properly....
or there are people here on the forum who can help...