I went with PR Coils because Justin(v8bait) recommended it and has custom tables tuned for them,theres somewhere here where he explains little in depth on the Pros with PR Coils,Also i run e85 with 19f temps here and car starts up with no hiccup at all.but i think thats more of Justin's wizardry tuning

im sure BimmerLife coils are good.i can only give feedback on what i know & have.hope this helps.