Discuss the many aspects of plastisol (screen printed) heat transfers. Topics include where to buy, how to put them on t-shirts, quality, pictures, stock (pre printed) transfers and more. Read the definition of a plastisol transfer here.
People just have their preferences on who they've used and who best fits their business needs (some people may need a transfer catalog they can show to customers, some people may just need fast turnaround on their custom orders - some people may need high volume orders while others need flexibility on shorter runs).
You can see the different opinions people have posted on the different companies in this thread and also by searching for the companies by name in the search box at the top of the page.
Quality from most of them seems pretty comparable. Longevity, who knows. Price is all over the place depending on #colors and quantity. Some are cheap on lots of colors but expensive on single colors and vice versa. Some companies are cheaper on smaller quantities while others are cheaper on high quantities.