I think you really can’t discuss one head without the others being brought up. My post above with the links is just a comparative note. 67autocross is having his PM heads flow tested.
For many here & even more so that most will not themselves port a head, the flow rates vs dollar spent is where it is at for them. Also, even though it has been said a hundred times a year that you just can not bolt on a big port flowing 300 and expect miracles still wonder what to do and how it can be done better. A plus without a big expense.
It’s also hard to get a low-ish duration cam with a lot of lift to take advantage of the high flowing head. (Enter in 1.6 rockers) While it is not completely necessary to do so and you can run quick without the extra lift, I find it pointless to get such heads and not lift the valve up high. A well done valve job and bowl porting can take you pretty far and fast if the rest of the car is up to the task. Most here have a heavy car and dream of big speeds and low ET’s.
IMO, the 2 heads above represent the best bang for the buck heads readily available for the small block Chrysler right now. 1 just a bit better for a price. Or the price.
