Copilot for business and CodeWhisperer Professional are the same price ($20/user/month).
While CodeWhisperer offers a free tier which may help individuals or pressure Copilot to lower personal account priced, AWS hasn't priced this very competitively for enterprise while their tool is still performing worse.
I wouldn’t take “performing worse” as a given without in-depth testing. I could see enterprises making calls like that based on things like the security checks or attribution for OSS over support for more languages.
I'm only speaking from personal experience and mostly with Typescript for both but CodeWhisperer feels like it has more lag before offering a completion and the completions it offers are often worse. It duplicates lines that already exist, it adds inappropriate indentions, where Copilot very helpfully finishes your line and stops, CodeWhisperer tries to add three more lines entirely and you reject it far more often. It's not worthless in this current stage, but it's not something to strongly praise either.
The security checks and OSS attributions feel very much like what "enterprise" software does when they know they can't compete, they tick boxes instead.
While CodeWhisperer offers a free tier which may help individuals or pressure Copilot to lower personal account priced, AWS hasn't priced this very competitively for enterprise while their tool is still performing worse.