How should I offer/sell my product? As SaaS, PaaS or Desktop App?

Hey Indies,

I come in great need of an advice.

I am almost done with building MVP for my project, it is a No-Code platform for UI testing. You can Create -> Debug -> Run -> Schedule UI tests without a single line of code.

Link: https://testnot.com
Live demo you can try here: https://demo.testnot.com/dashboard

It is like programming but with code blocks.

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Now, the question is how should I offer this product?

If I go with SaaS approach:

Pros:
      - Recurring Revenue
      - No maintenance for my users
Cons:
      - If they want to test the apps on not publicly available websites they will need to allow access from my app - security  is concern to them here

If I go with PaaS approach:

Pros:
    - Well I don't have to host anything by myself
    - Users will be able to run the app on their computers
    - I won't have to worry about network traffic
Cons:
    - Missing out recurring revenue
    - I provide them with all the code

If I go with Desktop app:

Pros:
    - As above, I don't have to host anything by myself
    - Users will be able to run the app on their computers
    - I won't have to worry about network traffic
Cons:
    - Also I am giving them my code
    - I will probably need to organize paying per license 

Any suggestion on how to offer this product will help me a lot!