Unless you can explicitly get a response from Panasonic if their inverter has clean mode which cleans the blower after operation to prevent mould build-up, go for the other two brands.

For Mitsu Heavy Industries, if your room is neither square nor rectangular and placement of AC pipe can be such that you want to reach all parts of the room at the same time, go with SRK10YL-S which has 3 motors for independent left and right in addition to up down. The SRK10YN-S doesn't have this feature (auto 3D) that the YL-S model have.