Not sure if it's in this thread, but NYT had a good article on this:
https://www.nytimes.com/2018/08/22/us/politics/offense-impeachable-constitution.html
Apologies for their pay wall, use anonymous browsing.
As for me, it's pointless to impeach with no chance of conviction. Politically, control of Congress is clearly a factor, but more critically would be how many smoking guns are discovered. I have no reason to doubt that DJT is an unindicted co-conspirator to serious campaign finance violations that likely swung the election. But unfortunately that's not nearly enough to get him convicted in the current environment.
Also as others have mentioned, and has been stated many times before, Pence might be a more effective POTUS (if the GOP doesn't lose control of Congress). By effective, I mean successfully works with Congress to implement a shitty agenda. Can we say with much conviction whether Trump or Pence is "better" for the country?