First big bike

I'm 44 and looking at my first big bike after passing my test. I'm a fairly heavy guy at 18 stone, 19 with all my gear on, and 5'10". I've fallen for the Tiger Sport but am unsure if the 660 or 800 is the better option for me. I won't be carrying a pillion and any luggage will only be enough to last a long weekend (so not too much). I'm wondering if the 660 will struggle with my weight but some say the 800 is too much for a first bike, so I'm kind of stuck 🤷