I am always looking for the perfect pen and I usually fail to find it. One that keeps coming back into my favour at least for awhile is the veteran Pilot Fineliner. These have been around for a long time and write very smoothly. The nylon (?) tip eventually rounds over with use. They are a reasonably priced pen. After a while I get bored with them, but I always come back to them.
The second is another Pilot, the V7 Hi-Techpoint. Smooth ink flow, a pleasure to use for handwriting.
Finally, a real classic and a very old design that still remains available, the Parker T-ball Jotter. This is a great ball point pen. I have an old plain silver coloured pen which takes refills that are still readily available. I bought a red barrel model a couple of years ago. Last year I bought a blue barrel model. Managed to leave it inside the pocket of some jeans. It did not survive a trip through the washing machine. Light pressure for handwriting. Classic design. A pleasure to write with this pen. A pleasure to write with all of these.