Difference between AR300M and MT300A with antennas

Purchased the AR300M and tinkering with it. I like it.

Now wanting to purchase the MT300A with antennas. Looks to be more tinker friendly than the AR300M and has an SD card slot.

What are the other differences between the AR300M and the MT300A?

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Thank you Glitch.

Knew a Glitch in the 1990’s from Detroit.

How weird, I know a Pete!