You're not giving anyone any useful information. And when anyone gives you advice you just throw out a few empty statements ("current state of the art of inform

You're not giving anyone any useful information. And when anyone gives you advice you just throw out a few empty statements ("current state of the art of information retrieval..."). If you really want useful feedback stop wasting people's time and just put both products out there so others can give you informed opinions. Otherwise just work on whichever you prefer. You can build up anything in your mind until it seems like the next big thing but the reality is you won't be acquired and will have to figure out a way to make money with whatever you do if you want it to turn into a business. If you like the work you're more likely to put in the hard time necessary to create something wonderful that attracts and deserves others' attention. So do what you enjoy.