I use the true talker legacy, Easy to use not as loud as the primos buck roar though. I have one of those too!!!
I've been through a few and definitely rely on a grunt tube for success. I like the sounds of the Primos buck roar. Its a great call and the snort wheeze is a nice added bonus. I've had a couple of the M.A.D. Buck Growl calls but both of mine transformed into duck calls for some reason...not an issue with the Primos. I like being able to make loud & throaty grunts.
This time of year I prefer to roar but do on occasion add some tending grunts . If I didn't do it all by mouth I'd own a Vector by Vector Custom Calls (best sounding grunter I've heard) .