Browser Isolation Testing Recommendation

I investigate a lot of reported phishing emails, and it's frequently helpful to launch them in an isolated browser to help determine if it is malicious, what the page is doing, etc. I've seen some tools around like Browserling, Joes Sandbox, etc. Sometimes I will spin up a VM for this, but that can be time-consuming.

What tools/apps do you use or recommend for this?

browser browser isolation cybersecurity isolation testing