> I have no experience when it comes to headphones the only thing i’m worried about is the sharp highs people have mentioned with the 1990s as i have quite sensitive hearing.

The HD600s are the safer bet IMO. This isn't to say you wouldn't like the 1990s over the 600s but there's a reason the HD600s are one the most celebrated headphone of all time. And for 130 quid less, I'd go this route.

Does the place you're ordering from have a return policy?