Unless you are going to start playing black metal, I'd stay with the old one. There's nothing wrong with it, although the new one is not bad.
I really dont like the first one. Its stiff and stale. I like the more organic second logo better. However I would probably remove the small pentagrams in the middle of the crosses.
Dont worry about posters for shows. All posters I have seen for extreme metal also have the band names in regular lettering below the logos.
The logo in your avvie looks like total shit.They both look like total shit.
Interpol does not have a real logo.Well they can't all look like Interpol's logo.
The logo in your avvie looks like total shit.
1st one, obviously.
Those are crosses imo.