Are you planning on any more implants after that?
My personal recommendation would be, save the P0 of your right hand for another implant (another recommendation would be an xMagic), my reasons for these recommendations.
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The LED implant you refer to, whether its an xLED or xSIID, Will read more easily and shine brighter through thinner skin, in P1-P4 for example.
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The xMagic has a T5577 and a Mifare Classic chip.
The T5577 is the same as you have in the NExT, is can emulate almost all LF chips, so having more than one T5577 is not a bad thing.
The Mifare Classic is probably the most common HF Chips and therefore the most “usable” plus it has a changable (N)UID -
The P0 position is a good spot for presenting to readers.