I can't really say one is best...
2" is desirable, as it is stronger, any hitch accessory will plug right in. winch cradle, shackles, bike rack, truck nuts, etc.
Less desirable factor is it really isn't good for departure angle. It's heavier, and a Volvo really has no business towing anything the little one can't manage.
The Volvo one is a bit of an oddball, and you will never find anything but a ball ready made for it, but they do seem built well enough.
Pretty sure they are all light enough to ship UPS. It's easy, wrap them in a bit of cardboard, and feel sorry for any smaller packages they beat up on the way.
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