KnowBe4 vs Proofpoint vs MS Defender

I am currently in the process of choosing the right vendor for phishing sims at my org and it seems like KnowBe4, Proofpoint (Wombat), and MS Defender are the main ones that orgs go for... I'm wondering what the main differences are between them in terms of features, pricing, support, etc. and also how I should be thinking about this generally.

We're an SMB but pretty security sensitive because of the nature of the data we deal with. We also …

cybersecurity defender etc features knowbe4 main org phishing pricing process proofpoint support terms vendor