wedge leading edge

I think i understand the bounce now on a wedge more bounce is good for wetter conditions or fluffy lies ect.

but what im not sure about is the shape of wedges. some of what i have seen the bottom of the wedge. Leading edge is straight so if you look at it face on the toe to heel is more or less a straight line. some i have seen however look spoon shaped. 
Whats the advantages on each of these types?

I dont tend to open up my wedges on shots i prefere to play straight and affect distances by either club loft or swing length

I have been custom fitted for length, but not lie or loft of my putter.  One out of three is probably more than the average golfer

Definition: Measurement in degrees of the angle from the front edge of a club's sole to the point that actually rests on the ground at address. The middle or rear of many soles is lower than the front edge. Bounce is most commonly applied to wedges. More bounce will keep the club from digging too deeply into turf or sand.

The amount of bounce needed depends on conditions. If you play courses with soft, fluffy sand, you'll need more bounce. If the courses you play typically have harder sand, you'll need less bounce. Playing from fairway - less bounce.

The type of swing can influence the amount of bounce needed, too. Players who swing their wedges steeply into impact need more bounce. Players who sweep through and undercut need less bounce.

Matt, a good firm strike with the wedge in its usual position will impart spin, especially if you take a thin divot.

One only needs to lay a face open if one does not have any club with the degrees that one is looking for. No need to open a 56deg wedge if you have a 60 deg wedge.

No need to be sorry, Wayne, if you honestly believe that a shot with an open clubface is easier to play than one with a straight clubface.

There are two reasons why one should open a clubface. one to de-loft it because one does not have a club with a greater loft than needed or to play a specialist shot, something which a high handicapper would not be able to play with any degree of accuracy and confidence.

One plays a bunker shot with an open clubface, but in reality the leading edge is still facing the target, only the stance has moved, together with a different ball position than normal.

Regarding grooves, that is one thing that I have been pretty lazy about during my golfing career. I do wash the clubs occasionally, but I never religiously clean grooves, like Mr Marshall does after every shot. I can stop a ball when I need to.