Botkit vs SendGrid

Hi, does anyone have recommendations for a chatbot framework? I am currently using Botpress, and I am not happy with it. The upside is: They pretty much have everything you can ask for in a bot solution, but the issue is: They did nothing right, the documentation is terrible, and you have this feeling of it falling apart at any time, which is what actually happened once.

My ideal solution would have:

• Support for Messenger and web (should either have a website chat plugin or straightforward integration with a different one)
• A visual builder (for none tech team members) | This is not a hard requirement though
• A slick DX for building simple things like API calls or more advanced stuff.
• We currently only have a "click bot," so no crazy NLP features required, but in the future a requirement

What I do not want:

• I do not want a solution where "someone else" builds the bot for me

For transactional emails, notifications, reminders, etc, I want to make it so writers/designers can set up the emails and maintain them, and then dynamically insert fields, that I then replace when actually sending the mail from code.

I think the ability to use a basic layout template across individual email templates would make things a lot easier (think header, footer, standard typography, etc).

What is best for this? Why would you prefer Mailgun, SendGrid, Mandrill or something else?

The problem I have is we are using mailchimp and not happy. We want to switch to mailster and are curious the easiest and best way to send emails with mailster.

The most important factors for me are ease of use, tracking.

I have only had experience with mailchimp, constant concact and streamsend. So ease of use is important.