Minimal shields on a Cutter (6A - 441MJ un-boosted) are better than max shields on a T9 (8A - 390MJ un-boosted), you're comparing apples and rocks. This is to say nothing of the extra cargo capacity, jump range, speed, utility mounts, hard points, distributor, etc that the Cutter has over the T9. You've actually got to work really hard to not see how much better the Cutter is...
(shield values from Coriolis.io)
(shield values from Coriolis.io)