The advantage that Helicopter has is instantaneous turn while hovering 360 degrees ...if the two meet in air and fighter misses the change to lock on , the plane will be making a inflight turn while the helicipter will already be targeting its tail in 4-5 seconds...time while its making a turn, helo could launch 2-3 missiles if radar is good on the helo
Provided the helicopter is armed with missiles that can lock on targets in air it an get kills
Speed wise , fighter jets have great advantage and also they can lock on helicopters , a helicopter can't outrun a fighter plane it has to engage in battle - the only chance helicopter has is if it can hide by landing - Fighters are fast striking
If there are like 4 helicopters and 1 fighter plane and they are with in dog fight distance , probbly the adavantae is for helocopters which can hover , but fighting from ditance and high low altitude perhaps the fighter will always win......
Techhology does plays a big role , what kind of trackin is being used on helo
While its doable I would prefer to be in a 4-4.5 generation fighter plane , and armed with bvr ... personally then be in helo moving at 300 miles / hr max