Although the questionnaire can give us a great deal of information. It can only take us so-far in terms of understanding your product and your key points of interest. Yet, based on the data provided, we believe that Mixpanel or Amplitude should be the solutions to most seriously consider.

Heap comes 3rd, after a small gap. Nevertheless, if autotracking and dramatically decreasing developer dependency are more critical to you, it could be game changer.

The above recommended are all quantitative tools, that provide great individuate or aggregated user data. Nevertheless, sometimes, mainly with low traffic product or B2B orgs, the ability to actually view a recording of the user's session is very valuable. That is what qualitative platforms, like Fullstory, Smartlook, HotJar, etc', provide.

The cons are the significant added cost and the need to sort out interesting sessions (0.1%) for the rest/

If the added cost (x2) is tolerable, we'd recommend implementing a qual platform, as long as it's integrated with your quant platform, so that you could use the quant to pinpoint and view only the most interesting and beneficial session recordings.   

* Heap have recently integrated a qual tool to their platform (due to the acquisition of Auryc). We have yet to evaluate it.