It is a tough question for me. I have carried daily a nice "51" (Aerometric Forest Green standard w/ gf cap Medium nib) for at least six months maybe longer. It is ultimately reliable and that's why I carry it along with another pen or two. The "51" just doesn't fail to write, first time, every time.
I'm also a big fan of vintage Duofolds, flat tops, streamlined, or striped, they are all great pens. Vacumatics too - great pens and fun to restore (usually).
The 45's, 61's,& 75's all have their place and I have a few.
Let's just say, I like vintage Parker pens.
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