The P30 is the 92-95 B16A ECU, you can have it chipped to run a 1.8, or you can have the P28 from the D16Z6 rechipped, it's about the same.
The knock sensor can be removed, unless you want it, but most don't as it is more of a nuicance than a help. But it is in no way going to make either ECU superior by it's being there or not.