Pic of some average English homegrown. And some links.

English weed.

BBC NEWS | England | Nottinghamshire | Man grew strongest ever cannabis

America weed

warlock cannabis seeds



Seems both are just as strong. Though strength means nothing to me, taste does. I'd happily swap that 29% weed for 19% weed that tastes better. I like the C99 crosses ATM, Lovely taste and smell, though maybe not as strong as some.
It all comes down to personal preference.