Forma Stanzol vs. Arimidex on cycle

[Harry Seaward]

Doing about 425 mg Test E / wk (1-11) w Dbol kick (35 mg 1-4) and winny finish (40 mg 7-11).

On cycle, is it better to use forma stanzol or arimmidex? First pin was this past Sunday so I probably have some time before this will really come into play.

Thanks in advance for any input!