Sorry, as you suspected, I'm not experienced with the OBS.
As for the Crown, given I haven't yet tried building, I like the .25 coil, around 70w give or take. I find it slower to get hot than the .50 coil, with maybe just a slight loss in flavor, but the .50 has fans too, and I will use both. I tried (3) Ni200 TC coils. The first two burnt out very quickly (though the first one was nice for an hour or so before that happened), and the third coil just didn't produce much vapor or flavor. That's just my experience, as you may want to check the feedback on other threads too. I'm not serious about TC, but if I were, I might choose something altogether different, such as the Freemax Starre Pro--- which has its' own set of quirks.
Also, I am a Herakles fan. I know I'm outnumbered vs Crown fans. The new Herakles Plus is just coming out...... I'd order one, but I don't see any coils available yet, other than what comes installed and in the box.
And, there are crazy deals online now for the SMOK TFV4, either the original full-size tank, or the Mini. I've tried the TFV4 with Quad coil at local vape shop, and it's a beast on a whole other level than the Crown, for those who don't mind the juice consumption, and vaping at mostly higher wattages. Couldn't see using it through the day, and there was so much cloud that in my 5 min of using it, I couldn't tell if I liked the flavor or not. Vaping it in a moving car or truck would be out of the question with the coil I tried at least.