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Pro Can provide 48v phantom power
Some microphones require this to work. It's good that this preamp can provide that if needed.
Pro Can choose mono or stereo recording for inputs
Mono keeps inputs separate giving versatility in post, stereo mixes inputs them together removing ability to alter inputs separately.
Pro Has 2x XLR combo jacks + 2x 3.5 mm input jacks
The XLR Combo jacks allow for 2x XLR jacks such as for professional grade equipment, 1/4" inputs such as for guitars, and two 3.5mm TRS inputs, such as for lapel microphones or consumer/prosumer grade equipment.
Pro Has headphone monitoring jack / output
Besides the built in TRRS output cable, there is a 3.5 mm jack for monitoring, but it could be considered a 2nd output jack using a male to male cord.