Assuming one player has been sent off and it has gone to 10-10....

If a team had ten players and the other eleven all it would mean is that the team with ten would have a player take a second penalty earlier. In the interests of total fairness the numbers have to be equal.

The equality in the current system comes because the team with eleven players can "lose" the person they think is the worst penalty taker. The team with ten have to use theirs.

Fairest way is whenever a draw cannot tale place is to take the penalty shoot out before the kick off. Then if there is a draw, the result is plain for all to see.