What are some alternatives?
When comparing Microsoft Bot Framework and IBM Watson Assistant, you can also consider the following products
Botpress - Open-source platform to create, manage and extend bots
Aivo - Skyrocket your Customer Service and Sales KPIs with a Chatbot powered by Artificial Intelligence. Give time back to people.
Dialogflow - Conversational UX Platform. (ex API.ai)
Zendesk Answer Bot - Chatbots
Amazon Lex - Harness the power behind Amazon Alexa for your own conversational apps.
Tars - TARS enables users to create chatbots that replaces regular old webforms.