Which is the best photo etch for the Hobby Boss Arizona? Looking at Eduard, Gold Medal and several others.

Saddly, I don't think there is one over the other really. It could come down to what is offered by each. I know I have the Eduard set and the full Lion Roar for mine. THe LR is the most comprehensive in that it come with the barrels and such, but the detailing on some of the Eduard sheets is honestly better. If GMM's 1/350 is anything like their 1/426 scale, it is still fantastic, but again, it comes down to what you feel you want to replace/add.

Have a look at some of the aftermarket parts from 3DModel and Model Monkey as well. Many of these 3D parts eliminate the vast array of PE needed...so you could possibly go with a smaller set like Eduard or GMM at that point, and just snag some barrels from Master or RB if you intend on switching those out as well.

I have always been happy with GMM and Eduards PE, not so much with Tom's. If I had to pick between the two I would go with GMM.