I have, recommend, and have not seen anything better then the LM-1 Wideband.
It is very complete and has incredible datalogging ability because it allows 5 additional inputs that are completely programmable.
Also if the sensor ever finally goes bad it's under $40 for a new one. Several of the offer units are using the much harder to find $200 sensor. (L1H1 IIRC)
No it's not a better sensor it is just 5 times the cost.
I've been running my LM-1 for well over a year now.
