Preferred $100-ish thermostatic mixing valve for shower?

My top candidates, based on affordability, are the SentinelPro Thermostatic Pressure Balanced Shower Valve by Speakman and the 1/2 in. Thermostatic Temperature and Volume Control Tub and Shower Valve and Cartridge by Pfister. Do you have a preference between these two--or some other valve at a similar (roughly $100) price?

Do you know which of the three types of non-digital sensing elements, liquid-filled bellows, wax, or bimetal, the Pfister valve uses?

The Pfister has a better warranty than the Speakman, but that only tips the balance if its sensing element is of an equally good or better type. The Speakman's is wax-based. The three types vary considerably on longevity according to this:

https://cdn.ymaws.com/www.laphcc.or...C8A-E47E6312FC2A/DRuckman_-_Mixing_Valves.pdf

Here are the valves:

https://www.homedepot.com/p/Speakma...re-Balanced-Shower-Valve-CPV-TP-PXE/306734906

https://www.homedepot.com/p/Pfister...Shower-Valve-and-Cartridge-TX9-310A/304960298