As KJ2 said not much different at all between the PD31 R5 and the PD32 R5 in terms of brightness and runtimes.
The PD31 has a 2-lumen Low that is handy to use at night when you want to keep your night vision. The PD32 S2 version is slightly brighter and the lowest mode has 6 lumen so somewhat closer to the PD31.
The PD32 is a forward clicky while the PD31 has a reverse clicky. However, the PD32 forward clicky can be used on the PD31.
The PD32 UA has an XM-L T6 and is very bright. Bigger and hevier than the previous PD31 and PD32 models.
The EagleTac is also available with XM-L U2 and is both bright and compact.
Out of all the lights, I'd recommend the EagleTac if "brighter" matters to you: more compact and lighter than the PD32, great accessories, and chepaer too.
My personal preference is definitely the Fenix PD31: ended up buying 3 of them and have no regrets. I use two of them with a PD32 forward clicky. Keep in mind the the PD31 has become extremely difficult to find at this stage though.