I remember when i asked this question when i first came back to the forum and i got hated for it, ahh well.
Although i use tar, a good grind is better because it is good in most weather conditions. Tar, however, is only DECENT in the summer months which isnt for very long in England. So if its dry your in look but in wet, it turns into big, wet sloppy, pooey, liquid dookie.
Hope that helped though