: Pullups or Body Weight Rows to compliment my routine? I'm mid 40's and have a great 3 X weekly program. Great for me in that it is tough enough and works for me as I'm getting good muscle tone and core strength. I am, however,

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First of all, you might want to read this article, "Pull-up or Chin-up" by Mike Reinold to get a better understanding regarding chin-ups and pull-ups in general.
The truth is that chin-ups and pull-ups both target your lats somewhat equally (no significant difference according to EMG studies); however, as you know already that chin-ups will isolate the biceps a little more, according to EMG studies.
So, if you really want to target your biceps more without losing the lat isolation, then yes you should stick with chin-ups from now on.
Regarding the body weight rows (sometimes referred to as inverted rows), this is just another variation (easier) for the chin-ups or the pull-ups. With that being said, you can continue with the underhand gripped inverted row in addition to adding a few sets of eccentric chin-ups towards the end of your workout.
I say you should try 3 sets of max of the eccentric chin-ups before you call it a day. Don't be surprised if your biceps are extremely sore the next few days. This is due to the fact that eccentric strengthening has been shown to damage more muscle fibers, but no worries, with proper rest and nutrition along with good sleep, your biceps will grow bigger.
Good luck!
Hope this helps!