From '66, when I hung out my shingle until I retired some years ago, I made my living pretty much solely via fashion and calendar model shoots, so I picked up a thing or two about how best I might do it.
I used both Hasselbad 500 Series systems (50mm, 80mm and 150mm) and Nikon (24mm - 500mm); after my first practical (and shocking) experience with the basic Hassy camera and 80mm, immediately after I'd traded up from a Rollei TLR, that honey of a Swedish camera was never used again without a tripod, studio/flash work very much included. You learn about horses and courses.
In contrast, the Nikon was very often used hand-held unless I was shooting heads or anything else where exact focus and framing was so important. Think about framing, hand-held, with any focal length, especially if you are going to go up to clothing manufacturer exhibition stand displays at 40" x 60".
With regard to the Nikon situation, let me make this clear: on medium speed film, say Ilford FP3/4, I was perfectly able to work 1/125th, hand-held, both in studio or on location, with focal lengths up to 50mm. The 135mm, hand-held, was never a possibility for me. Though I had perfect vision and the long-missed wonders of a split-image screen to help and comfort me, I could not guarantee a framing accuracy good enough, and certainly not focus accuracy, off a tripod.
I have no idea about the OP's situation - pro, am or whatever, but if you use the 135 camera format in any serious way, you need to pay attention to every available square millimetre you've got! Folks who claim magical, repeatable hand-held ability at sub-125th speeds, if honestly so, have earned my respect. I've nailed it on digital at about a 30th, but that was a miracle, and as such, a very rare thing.
Naturally, the OP must do as he sees fit.
Rob C