It's hard to say what any one person or any one group of people will enjoy most, because people have different preferences in a character meal.
Here are two important links:
Our character meal photo and information thread - this will show you what kinds of characters to expect to see at the different meals, and that may help you decide which one to choose:
http://www.disboards.com/showthread.php?t=2234435
Pictures of the Goofy's Kitchen breakfast/brunch buffet, courtesy of Disneynerd420 - check out Post #338 and Post #339 for all the fabulous buffet photos - food porn galore!!:
http://www.disboards.com/showthread.php?t=2268157&page=23
I wish we had more extensive photos of the other character meals' food, but people don't post photos too often of all the offerings.
Minnie & Friends, by all accounts, clearly has the most characters onsite at any one time. I haven't even been there yet but I can see that from the photos. BUT, there are consistently 'mixed' reviews of the food quality, with a slight slant towards the negative. I am sure the food is good on some days (I think all the character meals have off days in food and number of characters, but this one seems to get more iffy reviews of the food than the others, and more positive reviews on the character interaction than others), but it seems like, in that case, the number of characters is more the main draw and the food takes a back seat somewhat, and for many, many folks, having that many characters is the most important factor. This is a buffeteria-style restaurant, so it is not the usual all-you-can-eat buffet set-up, though it is labeled as a buffet. Minnie & Friends is also quite a bit less expensive than Goofy's, Ariel's or the new Surf's Up with Mickey.
Both
Goofy's Kitchen and
Ariel's Grotto are called "Premium Dining" by DLR. (Premium prices, that's for sure!!
) I think this is because Goofy's has the widest variety of food - it's really an extensive buffet - and Ariel's has some very unique, specialty items - almost on the verge of being fine dining, in a way. So those two elements put them into the "Premium dining" category. Usually, Goofy's has about 7 or 8 characters onsite at one time, but sometimes there may be 4 or 5 while they wait for the other ones to arrive. And it appears that Ariel's has about 5 princesses on duty at any given time.
Storytellers Cafe Critter Breakfast is favored by a lot of folks because it has a much more laid-back, quiet, calm atmosphere in contrast to the high-octane, upbeat fun of Goofy's Kitchen, Minnie & Friends and Surf's Up with Mickey. Also, you have the option of ordering the small buffet or from the menu (menu items are expensive though, so the buffet is a better deal). A lot of folks also prefer the food quality at this one. I have never seen more than 5 characters there at one time, and sometimes there may only be 4.
Surf's Up with Mickey and Friends is still relatively new, and we haven't gotten too many reports on it yet, but it seems like most of the reviews we have received have been favorable. And this is the only meal where Mickey makes an appearance, so that may be a key factor for you! Plus, this buffet-only meal features some unique items that can't be found at the other buffets (with Asian or Latin influences), even though the buffet is not terribly extensive. It sounds as if there are about 5 characters working the restaurant at any given time.
My preference: Goofy's Kitchen - breakfast/brunch, not dinner. Looooove me some Goofy's. I am okay with 5-8 characters and the huge yummy buffet. If I wanted the most characters, I would go to Minnie & Friends. If I wanted to meet Mickey, I'd go to Surf's Up. If I had to dine with the Princesses, I'd go to Ariel's. I have done the Critter Breakfast a few times and it is
okay, and I can see where other people would like it better in some ways, but it's not for me!