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Two different things - for two different purposes.
Maverick is a dual probe - remote. So I can go in the house - see what is happening with heat of the egg and the meat. Constant monitoring at a glance -- with alarms. Keeps me from getting out of bed during the night. If you do not do long, low and slow cooks - maverick impact decreases in my mind.
Thermapen -- instantaneous reading of temp when probing. I used to check temps with the old dial type, hand would get warm holding it. Heaven forbid repositioning for other readings. With the thermapen - stab in half a dozen places - know whats happening through out.
Maverick is for monitoring. Thermapen for instant checks, probes. ( note, we use the thermapen inside in the kitchen almost as much as outside ).