I think you both make good points, the only thing I'd contend is if you already have 650+ skill speed, is the 58 skill speed from boots doing more for you than 39 det would be? It's not skill speed vs det in general, just in some circumstances such as this where we are stuck with 2 rather lackluster options. Of course the rest of the gearset should go into consideration as well.. but either way.

From my own experience, having just shot up to 697 skill speed after some new gear last night, it's not doing anything beneficial compared to 647ish skill speed I had before. On the negative side of things, it's making it harder to double-weave in the opener. And while Selene doesn't help, it's a valid consideration (for me at least) if more skill speed is going to hurt my opening dps, and thus overall dps, I am better served with Det than I am with picking up any more skill speed. Others may be experiencing the same things.