Remember that the skate isnt any "sharper" in relationship to the hollow. It has more bite into the ice. The larger the measure of the hollow the less bite it has into the ice. Because f hte steeper angle and greater space found in the smaller ROH grind, it will sink deeper into the ice. As HeadCoach mentions, the larger radius makes the shuffle easier but it provides less bite for explosive lateral moves or drives into a butterfly slide. Your average goalie will be using a 1/2" ROH.
Some goalies are also adding a radius to the profile of their blades rather than flat. The average is between a 28 and 20 foot radius. Other goalies will use two different Hollows on one blade. The heel and toe of the blade will have a much smaller ROH to provide added bite for toe stops and heel push from a down position. Some places call this a TRI-GRIND. Seen more in the swiss and finnish elite league goalies.
As a general rule, when adjusting your ROH, start at a MAX value and work down into a progressively smaller ROH in 1/8" increments until you DONT like it. Going from small to larger ROH grinds away much more blade! Move back up to the last you liked. Your weight, ice temps and such all impact the grind performance. Do not assume that a loss of control on a new grind means its just the hollow. You have to inspect your grind. Even edges, placement of the center of your rocker and ROH have significant impact when there is a change. Some of the change you notice from this grind may be more than just an ROH change.
Speed increases with an increased ROH. Bite for cutting, stopping would come from a reduced ROH. Your choice will depend on what role you play for your team and what your strengths are.