not sure on the tren but there is no evidence that suggests more or less effect doing test subQ VS IM.. SubQ surely offers more convenience and less worry
Actually.. it might be better with tren since tren is so strong of a compound.. getting absorbed SubQ has a slightly slower rate than IM
As with many people and the preferred method,, some effect is simply influenced by the mind.
Another good thing about subQ is if your doing eod injections its easier to do and not feel like a pin cushion the IM way or weekly large doses can easily be divided up conveniently for more stable test levels
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Here is a simple post I found.. and there are many studies you can google up.. all of which suggest results would be equal however subQ being safer method
Get 20% Better Results From Testosterone | T Nation