Copilot is what I talk to when I just want to rant and know I am not dealing with any issue that is going to get super complicated. I'll use GROK or ChatGPT when I'm really digging into the code. I'll toss Copilot a chance at some of the code just to compare it to the others. Sometimes it is useful but when it comes to coding or serious things it is the one out of the three I say is the least reliable.