The quality of lock varies depending on where I am, and some places I would keep riding instead of trust a lock. On the other hand there have been places where I did not use a lock for several days in a row. Situational awareness is the key.
I usually just use a small cable lock, roughly 3/8 inch diameter, plus a small skier type lock for a quick run onto a convenience store. My valuables are in a handlebar bag that goes in the store with me.
My cable is not big enough to go around both wheels in the frame. I usually use bolt on skewers instead of quick release when touring.
My titanium bike looks more expensive, which it is. That bike gets a better lock, an Abus Bordo link type lock.
On one tour I did with a friend, he was quite concerned about theft in that area, he brought a huge chain and paddlock. I thought it was excessive but he carried it instead of me. See photo.
The skier type lock in photo below. It is quick and weighs nothing.