When comparing Forest vs Boomerang, the Slant community recommends Boomerang for most people. In the question“What are the best Chrome extensions for productivity?” Boomerang is ranked 5th while Forest is ranked 12th. The most important reason people chose Boomerang is:
It's easy to send emails in a different time zone using the standard time zone abbreviations such as: PST, EST, PDT, EDT etc.
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Pros
Pro Gives you a feeling of accomplishment
You can easily visualize how much time you spent productively
Pro Kills your tree if you open other apps
... except those on your whitelist
Pro Makes work feel enjoyable
Planting trees makes you feel enjoyable
Pro Activity log
Pro Support for time zones
It's easy to send emails in a different time zone using the standard time zone abbreviations such as: PST, EST, PDT, EDT etc.
Pro Has iOS app
There is a full-blown iOS app for managing or creating emails.
Cons
Con Not a true pomodoro app
There's no option to set time for a break, and it doesn't automatically start a new session after finishing the current one
Con Looks too much like an iOS app
Even the share icon is loaned from iOS
Con PC browser sync is limited
Con License is per Gmail account
If you want to use Boomerang with multiple Gmail accounts, you will need to pay and manage subscriptions for each Gmail account.
Con Difficult to edit emails once you've scheduled it to send later
Half the time you can't edit an email once you've scheduled. It's a very buggy function. The more reliable way to do this is to cancel the scheduling, go back to the drafts/inbox etc. Edit it as a normal draft then reschedule it. It's quite the hassle. For a paid product it shouldn't be this hard.
Con Webapp doesn't let you schedule a draft you've already made
The web app can't schedule pre-existing emails you have made in drafts. You can only schedule entirely new email content making it really awkward to have to copy and paste in a mobile app.