If you mix it with a lot of vermouth, olive juice and the olive it is not of importance which Gin you use. Straight gin with an little bit of ice and New Amsterdam is perfect, add the olive and a tiny little bit of olive juice and you have the perfect dirty martini.
The concept of a vodka martini is simply an obscenity.
My dad felt the same way. Friends of mine who like gin martinis said he made really good ones.
I like gin but, to my dad’s disappointment, I wasn’t crazy about martinis. I did like an olive that had been soaking in one, so when I visited Dad or he visited me, he’d put an extra olive in his martini for me.