Maybe there is a review of Weatherlink live somewhere that includes opinions?
WFL and WLL are both good products so a choice has to come down to individual use cases, ie
exactly what do you want the unit to do (and even then there will be differences of opinion I'm sure - decisions are rarely clearcut). You need a bullet list of features that you require and then see how well the two products compare. Sometimes there will be a clear feature that only one device can deliver. eg do you need:
* WU Rapidfire, in which case only WFL can do this (WLL will give only 15min updates at WU via wl.com, though wl.com direct will give 1min updates - not quite sure what the appeal of WU is other than Rapidfire when wl.com will otherwise do much the same on browser or phone app));
* Uploads to platforms other than WU or CWOP ==> only WFL can do this;
* Data from more VP2 wireless transmitters than a standard console can receive (or high-precision supplementary temp readings), in which case Weatherlink Live will be the choice;
* Is price really important - if so then WFL is cheaper;
Etc.