I've had so many over the years, and still have ...
If I had to pick one, it would be this Würth Utility Knife. It is as well made as the Milwaukee Fastback Gen. 2 that I have & has a bit holder, that unlike with the newer Gen. Milwaukee Fastback, is build into the rear end of the knife and not to fold out. Top notch ergonomics, at least for my hands.
To me that is the perfect utility knife to have around, easily used to cut or to fasten a screw/bolt on gardening tools, shed or fence or anywhere else in and around the house. Handle is made from Aluminum. Only drawback, it can't hold any spare blades.
It comes with some bits and a pouch.
Took a brand new one out for the picture:
[attachimg=1]
That said:
For 18mm snap off blades I prefer the Tajima DC 560. They call it the Driver Cutter, it makes a great can opener/ pry-thingie/ and could fasten a large slotted screw if necessary. The Tajima "Razar Black Blades" are by far the best I've ever used. ->
https://www.tajimatool.com/product/dc-560/
I really like the Auto-loading feature of the Snap-On UTK 150, but it seems whoever is the supplier/designer of this "thing" has never heard of ergonomics ... And it gets incredibly slippery with sweat or workshop fluids. If I had a mechanic shop/employees I'd ban it straight out. That said, it's great for light duty cutting when you go through a lot of blades because what you cut is highly abrasive. ->
https://shop.snapon.com/product/Utility-Knives/Auto-Loading-Utility-Knife/UTK150
Milwaukee Fastback Gen 2 is tried & true, and has been my absolute favorite until I got the Würth. I love the fact that it has a fold out holder for spare blades. Don't think the model is sold any longer by Milwaukee, but there are plenty of others in Milwaukee's line-up.
I haven't bought one yet, but this is also an interesting utility knife I think. It's a 2 in 1 utility knife & scraper. ->
https://toughbuilt.com/product/scraper-utility-knife-tb-h4s5-01
Kind regards,
Oliver