1. Input
Chatgpt - text based dialogue like queries
Alexa - voice based interface
2. Output
Chatgpt - text based on the input query
Alexa - voice, can perform action and do small tasks
3. Usability at work environment
Chatgpt - can be used a quick research tool, good at organizing and listing facts.
Alexa - can be used as a timer, Its more of a personal device.
4. UI
Chatgpt - Its well thought of and you can organize your work within chatgpt. Goto previous queries etc.
Alexa - Its a exceptional tool to manage all things personal/office like music, devices, simple queries, etc.
5. Common drawbacks
Chatgpt - Good at facts but content lacks personal touch or anecdotes or stories
Alexa - As good as the alexa skills but most specific questions are taken to web search
Summary
AI tools have entered into our life like a bicycle for a kid. We have to learn to use the bicycle else there wont be much fun. Identifying professional use cases for AI without compromising data security and privacy is a challenge like the kid ensuring not to fall from cycle before his friends while learning to drive it.