To the OP:
Sir, you have to decide for yourself if a Glock is the pistol for you, but if you thought highly enough of the Shield EZ9 to lay down the cash for it in the first place, and since it is known to work well for others, there is reason to believe that it might be worth further evaluation and some additional minutes on the workbench before you just trade it out.
I have neither stake nor interest in your decision, but I would suggest from personal experience that decisions made in states of anger or irritation are rarely as good as decisions made when cooler. I wish you a satisfactory resolution of the current situation, and I hope you find yourself pleased with whatever small modern nine ends up in your safe. If it happens to be the Shield, you will find lots of interest and experienced commentary from the S&W devotees on this forum. (But probably not so much from me, because I'm mostly a revolver guy.)