For pens that I give away I am starting to lean more towards the Euro. Relatively cheap and you can make em look alot more expensive with a little effort. Jr gents and now longclicks sell the best.
My FAVORITE is the Imperial
My most common is the Jr Statesman, enough trim to make it "special" simple enough that it allows the material to be in charge.
'Best' and 'favorite' are different, but I suppose my favorite is the lowly 'Cigar'. Folks seem to love 'em, and they can look quite 'classy' with the right blank. For 'best', it would have to be the Majestic series for me.