Unless the post has changed from the original post, I don't see this as exposure. Silver Dream is marketed as a sleeving DVD (says so on the page you buy it from) and Digital Dissolve is known to involve gaffed coins.
Short answer = Silver Dream
That being said, I'd base my decision around a few factors:
Silver Dream is definatly applicable to more situations, hands down. I use various vanishes from the DVD in other contexts on a regular basis...and the fact that the main version of the effect is gimmick-free and impromptu is great.
The catch? Obviously, you have to wear sleeves. Granted, there's a "sleevless" gimmicked version...but you have to do extra work to end clean and frankly, the part of the DVD that makes the purchase worth the price is the description Justin does of sleeving.
If you're in a controlled environment and you're working, say at a restaurant and will have the gimmick on you, DD is a fun effect. Very visual. However, Silver Dream is very visual, and can be performed without the gimmick...here's MY breakdown:
DigD Pros:
VERY visual startling change
Happens on the spectators hand and gets them involved
Easy. There's one move you'll have to work on to get it looking 100% natural, but still, easy.
DigD Cons:
Gimmick involved, not impromptu.
IF the "easy" move is off JUST A LITTLE, the effect mechanism becomes painfully obvious.
End slightly dirty---easy to clean up because all heat is on the coins in the spectators hands, but still, end dirty
SilverD Pros:
One on one sleeving lecture with Justin Miller.
Three vanishes can be used individually during other routines.
End clean. Let'em grab at your hands...the coins are NOT there.
SilverD Cons:
Let's face it, it's fairly difficult to get used to. You WILL drop the coins in the beginning. It WILL take time to get it down. You most likely won't be performing this one for a little while...especially if coin-work is new to you.
You have to wear sleeves. There's nothing special about the gimmicked version of Silver Dream that would make it worthy of the purchase price....plus then you're adding the con of having to have a gimmick on you.