a little bit of all the data if you can or just get the data that seems the most reasonable and start doing model building on that the biggest mistake companies make and I've seen this many times is they say well we're gonna have a two-year project to get all of the data collected and then they get all the data collected and they don't have the signal that they need or only five percent of that data was important so I would say just like it was mentioned by grandmasters when your model building you go quick you go small you go fast