Depends upon your steadiness of hand - free-standing. Tens can be very useful - with good quality lenses, but with the not-so-good makes they can exaggerate any problems such as a bit of shake - heartbeat and pulse after climbing or fast walking, and if you use them a lot during the day they might 'pull' the eyes a bit.
My preference is 8 X 42 for general work and they don't tend to give shake problems, but probably the most eye-kindly are sevens. If your work is in woodlands and you can hump a larger glass about, maybe sevens with a large objective lens for light-gathering - but a lot does depend upon the quality.
As flytie says - personal preferences only.
Incidentally - can any of you optic-wise fellows tell me why you can look down a 6X42 'scope on your rifle and spot your shots at 100 yards, but not see the holes very well with an eight power bino of the same quality glass ?
I've used a 25 power three draw telescope all of my stalking life in the hills; first a Ross and then a Greys, and with a few years practise you can use them pretty well semi-freehand with a walking stick and spot shots on paper, but that's quite a difference in power.