In the scenario you mentioned, the British have a Hurricane available to them. IMO, the Hurricane was better at strafing infantry, HT's/Trucks and lighter skinned armor. the likelihood of taking out a Tiger is slim at best. My approach to them is pound them with the 25lber's you can purchase and get the morale down, strafing should also bring it down some and then move in with Shermans or infantry to finish it off. It can be done.
As for some of the other aircraft, the Stuka generally as a good chance of killing off armor, the FW190 can also but, not with the frequency of the Stuka. Typhoon and the P47 are also good on the Allies side.
remember, your best chance is from side or rear shots on armor.
Not sure of the percentage either but to me 90% seems high. Missiles are point and shoot and forget...and they don't always fly straight.
Just my 2 cents.
