I'd go for Seattles dahil dun kami lagi tumatambay but as far as taste is concerned, I can't get enough of Xocolat's Vanilla Mudslide.
Bo's is okay especially if you have a car and you need to hangout for hours. They don't issue parking tickets that needs to be validated unlike in Seattle's and Starbucks Petron.
For those who wants access to WIFI, Kourtyard is the way to go. Unlike in Starbucks where you have to pay for it, or in SBC and Bo's which requires a minimum purchase for a 1 hour free WIFI. Kourtyard costumers can easily connect to Tapa King's (restaurant beside Kourtyard) unlimited free WIFI.
IMO, Starbucks is overrated.