A phr can do 100-130 or so mW and a SF-AW210 is like a 6x. 6X's are more reliable though. SF-AW210s are a little unpredictable...some will act like 4xs and i think some have acted like 8xs...there is a whole thread on it.
IIRC Both aren't the most reliable diodes, but the PHR is still a lot more steady. IMHO, the PHR is cheaper, powerful, and (for the most part) steady if you run it at around 120mA. The SF is sometimes capable of higher powers, but is unreliable. (Anyone can feel free to correct me if you think anything I said is wrong).