Which SKimmer 9015 or 9020??

[ncny21802]

What is everyone's opinion. I am currently running an ASM G3 on my tank. It is 125 gallons with 150 gallons of total water volume. The tank has SPS, LPS and softies. It is also heavily stocked. I ordered a 9015, but was wondering if the 9020 would be worth the extra $$$$ or is it really not necessary. Any help would be appreciated

 

[snart]

i have 150 gallon tank with 9015. it works great.