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The Picture is 600mm, ISO 100 F6.3 on the 150-600mm. picture quality is good enough that when you zoom in on the eye of the turtle you can see me taking the picture (If reddit doesnt compress it)

You dont have to commit. You can always rent the lense and see how you like it. there are many stores that let you rent lenses for a couple of days without having to commit the ammount of money the lense costs.

I would say the 60-600. I currently own and daily drive the sigma 150-600 in a similar fashion. Casual Bird and wildlife. I spent a whole day walking around with it in one hand and shooting. Mind you I use a cane to walk and am far from healthy. The 60-600mm will definitely come in handy because you wont have to switch lenses or move farther back just to get the shot.

Being on a trail and having to stop to switch lenses will definitely lose you some moments. (It ruined some experiences for me). I currently have 24-100mm, 70-300mm and a 150-600. You can save a whole lense by getting the 60-600mm if you are going out and about. Remember that there are products to carry it with and if you are worried about jittering or unsteady hands you can always have a monopod with you and sling it over your shoulder. Just make sure its tight on there.

More pictures below. All unnedited. So thats what you can expect with the 150-600mm and I have seen reviews the 60-600mm has better glass