All the g2 Vision charts will have the same level of detail regardless of Small, Regular or Large. It's only the geographical coverage that changes.
As commented, it's a matter of what you need at what price. If you're only ever going to cruise in one area, then a small or regular makes sense (eg a regular will cover all the south coast plus N France & CI - enough for many people).
However, as soon as you visit two separate areas, then it usually works out better to go for a large.
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