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It's my opinion that Doran is just much better marketed. They are advertised everywhere. However when I shopping for a system the main reason I went with TSG was the sensors. Being able to air up the tires without having to remove the sensors was huge for me. It is the removing and replaceing the sensors that leads to the little gaskets in the sensors failing.
The negative things I have heard about Doran are the leaks, and eventual low pressure alarm. I don't believe that it is epidemic, just a symptom of that kind of sensor. The flow thru sensor has worked great, and I have never had to remove them after I put them on. As for the size, that has not been an issue either. I screwed them on, checked the pressures and forgot them. The read out is easy to see for both the toad and the RV. The display shows all the tires, and rotates the display showing the pressures.
I don't believe that there is a whole lot differences in the way that the individual systems transmit information, so there is not a lot of differences there. Ultimately it is up to you. Good luck!
Sarge
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