heater tee

Hi All, I am planning on replacing my heater T's (and the corresponding hoses) before an upcoming long road trip and wanted to ask if I should go with metal or plastic. I haven't really seen much discussion about the pros and cons of replacing them with metal. The only con I can think of is...

It seems to be a commonly held belief that the 100 series is overall a more reliable vehicle than the preceding model. However, I've begun to question this dogma lately. It does em like the 2UZ doesn't have as many common oil leaks as the 1FZ, and head gasket failure is far less common in the...