To me, the Sandbelt and the Heathlands are two very different families of golf courses.
Most of the Sandbelt courses are defined by the bunkering style of Alister MacKenzie, who planned the bunkers for many of them, and then left Alex Russell in charge of overseeing the Morcoms in charge of building them all. MacKenzie was a big proponent of carry bunkers, and as Scott W. notes, these are all over the Sandbelt.
The bunkering on the heathland courses may be different, because they were trying their best to preserve the heathery terrain on the back faces of those bunkers, which mitigated against having the bunkers in a carry position. They also focused less on carry bunkers, because in the days before 1914, most golfers did not have the ability to make consistent carries of any length, due to the equipment of the day. Nearly all of the best courses in the heathlands were built half a generation before MacKenzie, by Willie Park and Herbert Fowler and Harry Colt and J.F. Abercromby, and a couple by Tom Simpson also, and their styles were different than MacKenzie's, particularly in regard to bold greens contouring. Woking is really the only one of the heathlands courses to have a wild set of greens, as opposed to one or two single examples.
Not many Sandbelt courses have MacKenzie's greens, though ... not only because he was only there for six weeks, but because several of his commissions were renovations of existing courses [including Kingston Heath and a portion of Royal Melbourne], and those clubs wouldn't go for tearing up all the greens and taking them out of play. Most of the cool greens contours at Kingston Heath [except at the 15th hole] are the work of Graeme Grant when he was the greenkeeper there, not MacKenzie. Yarra Yarra probably has [or had
] the wildest greens contours of any of the other Sandbelt courses, which is why I always thought it was MacKenzie's design, but the records seem to indicate it was all Alex Russell's work.
I would agree with Scott's overall conclusion that the London Heathlands courses win out in a match against the Sandbelt, due to greater depth and more variety of design styles. But none of them individually are a match for Royal Melbourne, and probably not for Kingston Heath, either.