Njoy Pure Wand Stainless Steel vs Womanizer Premium

I think I want the njoy just because it would give the best mix of being comfortable for relatively long term wear while also being “hidden” if I wear it out on errands. I like the oxball for stretching so far but it doesn’t really “feel” like anything IMO, so I’m hoping for a plug to mitigate that while also being comfy long term. These plugs are pricey which is why I kinda wanna be confident on size and I’m hoping it will be my “final” buttplug. Just not sure how ppl choose to either size up for down when they are between sizes (or if the L and XL have any other major design differences besides diameter)

I currently have the womanizer premium which I absoutely love but I find it is too bulky and hard to use during sex. I'm after the same style of toy but smaller so I can use it with my partner.