The F22 is just $229 so yes the MXT would likely win that win that battle. I'm not sure about ID accuracy of the 2 in every type of ground. Sometimes the MXT could ID a small coin at 6" & sometimes failed at 4". I had an F70 and couldn't use more than a tiny fraction of the power, deepest coin 5 1/4". Also it gave off loud noises that IDed as coins but nothing was found. Another F70 owner said it could probably detect a hot rock at 10". The F70 is now the Teknetics Patriot at $399 with coupon. Says it detects coins to 11"-12".
White's did a video of air tests MXT 10.5" on quarter, MX5 11.5" on quarter, and MX Sport 12.5" on quarter, with a lot less noise. I'm guessing the MX Sport and AT Max might be very close in many soil types as the air tests aren't much different, In a few months, Minelab will be introducing the Equinox 600 for $649, another waterproof unit to compete with the AT Max and MX Sport.