I have a few Opel/vauxhall keys that I want to renew. with Delphi, valeo and Siemens types. probably astra h,Corsa d and zafira b.
Delphi:
13.188.285
13.189.115
13.387.369
Valeo:
13.149.660
Siemens:
13.213.488

Suggestion:

1)

Xhorse vvdi prog can renew keys for Opel

Free download GM renew files.

Different number key does not matter if its another number the file is the same.

Example:

Reset/ renew/ virgin Opel Astra H key PCF7941 with VVDI prog

2)

OBDSTAR supports some of Opel key unlock

I"ve renewed 5-6 Opel keys (Corsa D, Astra H, Zafira B..) with Obdstar x300 dp plus, surprisingly it works perfect..

OBDSTAR Opel key renew list
V1 (PCF7341)
V2 (PCF7341)
V3 (PCF7941)
V4 (PCF7941)
V5 (PCF7341)
V6 (PCF7941)
V7 (PCF7941)
V8 (PCF7341)
V9 (PCF7941)
V10 (PCF7961)
V11 (PCF7341)
V12 (PCF7341)

In Sum, there is no best tool for Opel key renewal. Try it with vvdi, mk3, abrites, keydiy kd, Barracuda.plenty of other tools supports this.