hi guys .... hope you may help me in my queries...

what is the meaning of "control" that can be found in strings and rackets?
what is feeling of a string with very much "feel"?

i just changed my string from a ProAce to a Yonex BG-66 at 24lbs yesterday...
i had the option of choosing between a Yonex BG-85 and BG-66 yesterday, but the seller said that BG-66 is much better.

can anyone please help me compare these two strings in terms of power, control, durability and sounds. your help is very much appreaciated...