The 950 and 950xl both will take pictures as fast as you can click the camera button or you can turn on rapid shoot but at the size of the files its a waste.
You can also take living images and choose your photo from motion video later.
The guy talking about slowness must have had a budge phone cuz the newer ones are just as fast as any android or iPhone and its pics are 20mpx. Either that or the last Windows Phone he had was a Nokia 920 as per his profile. Sounds like jealously
As for the HP, my motherlaw got one 6 months ago after the stability and camera fixes. Never had an issue.
Oh and btw we can edit the flash on the fly and choose which flash brightness to resave the picture under...built in without an app.