I tend to prefer using TLRs w/o inboard meters, just to bypass the commonly associated issues (meter death, battery workarounds, PITA EV systems, etc.) and because using a modern hand-held meter is more reliable. In addition, going hand-held (or even meterless) is far hipper, which goes to the heart of why one would bother with a dark, slow, cranky old TLR to begin with.
Sometimes, however, I relent in the face of superbly implemented coupled systems. When they are working, the coupled CDS meters in late model Yashica Mats (124-124G) and the selenium meters in the Rolleiflex F series are miraculously convenient. Other drawbacks, however, apply: selenium is not so good for low light sensitivity, and CDS suffers from memory effect.
The bald truth is that I just like TLRs, and my devotion is pretty indiscriminate.