I am sure someone else will post....but I have shot a few different grips on longbows that are considered somewhat traditional...
I prefer the shallow locator overall......dished and locator on my D bows....humped on selfbows. That is just my preference though....
Dished Grip- I used to think this was the TRADITIONAL grip but apparently is not. this is grip I see on most old D shaped style bows and what I have on my Noble Longbow. Narrow grip, dished in middle as is name...takes some time to build consistency if not familiar.
My Mohawk Sparrowhawk has a locator grip...they come in varying extremes from a slight depression at top of grip rather than center as in dished...to a more pronounced dip near top...but all are considered locator as they only give you a place to locate the web of hand at top of grip...not rest of hand placement. My Lee Robinson longbow has a less pronounced locator. Robertsond Stykbows does the locator and then calls the less pronounced one like my Lee Robinson a traditional styled.
Then you have the humped/bulbous grip built up grip that is like on my selfbows..
Here is a straight grip, Howard Hill style...I dont own one but a lot of HH bows have them..here is Redman by HH
The recurve or pistol grip is a highly stylized grip similar to that of a recurve and allows a HIGH wrist or MEDIUM wrist while shooting.
I think these are Stalkers by South Cox...much more pronounced locator grip that is more similar to recurve grip. They are supposed to be very comfortable and repeatable for shooting. Never shot one myself but everyone that has one loves it that I know... See these also in the hybrid longbow/recurve bows many times. Some bowyers designs allow use of both recurve and extreme reflex longbow limbs on same riser if a takedown.
All this being said...it comes down to personal preference. I prefer shallow locator grip first...then dished...with humped like on my Strunk right there with it. to me they are more traditional but in the end it is what YOU LIKE not me.