Most Dangerous? Philippines, closely followed by Thailand only due to the bombings in the south, otherwise I'd put Indonesia ahead of thailand.
Friendliest? Thailand by far
Best customer service? Thailand.
Best beaches? Thats tough, all 4 places have some gorgeous beaches and some not so gorgeous beaches.
Most uncomfortable I've been in my life? Paranaque City in PI, some real low lifes there, followed by Jakarta
For me having traveled all 4 places quite a bit, I'd have to say I LOVE THAILAND, the land, the people, the food, just overall fantastic. Malaysia is pretty decent, but the people are pretty anal retentive. Indonesia is ok, but everyone always seems tense, and that tensions gets on you a bit. There are many great places in PI, but many many scary places as well, the people are ok, but PI has the #1 rating in my book as far as swindlers go.
Of course if you ask any local which is better, they will claim their country, but I'm a Spaniard by birth and an American by citizenship, and I LOVE Thailand.