One more "Which implant should I get and other dumb questions"

Ok, after over 15h laying on the airgap capacitor i have no changes in the cloned cards data (T5577 and MK1) but the MK1 read went from 8 seconds to over 200 … not sure what that is about …
Next test will be on the end of the coil.

One more thought on implant selection:
Is there any advantages to the xEM over the NExT for the LF chip/antenna?
Also, is there anything the Ntag216 does that a DesfireEV2 cannot do?

If the answer are Yes and No respectively, im thinking it might be smarter to get xEM and xM1 on one side, freeing the other side for xDF2 (or an apex when it comes out)

Also thinking about the inner wrist for a small flex down the line … would a metal watch band bother anything there (having the implant bellow the band)?

Also, just confirming the NExT and xM1 cannot be side by side in the same P0 right?

Just weighing all my options/possibility before doing the big jump,
Thanks