The only think I could think of that would be faster is that you could do an in person application (only if you got the fiancée visa, not MVV), which you cannot do with the spouse visa. You'd end up having to wait for your fiancée visa though. It ends up costing more and the process is longer in time (pay, apply and wait for fiancée visa, travel, marry, pay and apply for FLR, wait if you didn't apply at PEO OR apply, pay, and wait for MVV, travel, marry, travel back, apply for spouse, travel back VS UK spouse signs up for ESTA, travels to US, get married, apply, pay, and wait for spouse visa, possibly even travel back together).
Maybe if you were marrying in a country where the documents had to be translated or there was a high rate of visa fraud, there might be a benefit from marrying in the UK, but the US isn't one of those countries.
And everyone has given poor advice on here at one time or another. Everyone.
