@Babloo
As a SAS skilled person working with SAS Viya 3.5, My preference would be
Use the Task Prompts
Optimize my SAS data sets for querying.
The Task Prompts are more mature and provides lots of functionality out of the box (Stored Process Prompting Framework). It's shortens the development time.
But if you are a Web Stack Developer (Web, CSS, JS, Ajax) you may find the developing the HTML page more appealing, but you'll still need to interact with SAS skilled person, and someone who is familiar with how SAS Stored Processes used to work, as they are fundamentally provide the origin of the Task prompts.
Just my 2 cents
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