exit seats and load check please

currenlty booked on VS45 LHR-JFK on April 1 -taking my son to the Big Apple for an early 21st pressie.
Am i correct I can now buy exit row seats by calling the Fc now?
I have currently bagged 62 H & K -are these better than the extra leg room ? (never used them)
and better than exit row ? ( i am guessing not)
which exit row is better 39 or 49?
and lastly could someone please do a load check on 45 and also the earlier flight 003
many thanks
Am i correct I can now buy exit row seats by calling the Fc now?
I have currently bagged 62 H & K -are these better than the extra leg room ? (never used them)
and better than exit row ? ( i am guessing not)
which exit row is better 39 or 49?
and lastly could someone please do a load check on 45 and also the earlier flight 003
many thanks