It's a matter of preference I think. I have a '34 TTO Aristocrat open comb, the gillette NEW long and short tooth models, and both Old and New Type vintage all open combs. I think the NEW model gives the mildest type of shave and the old types are less so. The aristocrat just gives a good shave and I like the style. You just have to try one and see what you think, if it were me I would suggest you pick a NEW type and give it a go. good luck bc
I think the differences are well explained. If your angle is off, you will see teeth marks in the lather.
Also, yes, you will need to try it. You can probably get a cheap shaver grade NEW on BST and it will give you a fair idea!