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The Thermapan and the ET-73 are different tools for different jobs.
I have them both and use them both.
The Thermapen is not designed to monitor the temp of your smoker or to stick in a hunk of meat and leave it there. Likewise, it is a little hard to check temp in a grill full of steaks on the fly with an ET-73.
I gotta say I'm lovin my new super fast thermapen. I still use a wired thermometer but can now take very accurate spot checks from different points in the meat in mere seconds. Good for many applications in the kitchen as well. It was still expensive with the private sale but I'm glad I got one.