I have ER competition oil coolers and really like them. I haven't been on the track yet but have had some spirited runs and my oil temps are pretty low. I think with the increased surface area you are better off with the competition. The only bad thing my shop said were the aluminum shrouding was a pain and not trimmed well. Also it affects the fit of any carbon fiber pieces you go with.
BMW 135i Jet Black AT. Hpf intercooler, Hpf exhaust, injen intake, ER competition oil coolers, ER charge pipe, Tial BOV, AR catless DP,BMS OCC, VMR 718s 19s, BMW performance spoiler, agency power rear diffuser, slek lip (on highway somewhere), FXomar abs lip, Ohlins Suspension, All M3 bits, Cobb protuned, turner 3 clutch LSD, Escort 9500ci