Imo....

If you are constantly at a stable blood level you adapt. Its like staying high. After a while high becomes normal and... blah.

Your natural test is peaked when you wake up and stimulated by many factors fluctuating throughout the day. Natural test is vety potent. You have those times naturally where it peaks and you feel like a king and can really get some shit done.

Suspension is the thing most like natural test imo.
You take your stable level test on cycle and give it a swift kick in the ass with a little suspension and things happen.
More powerful workout while feeling great with a little slin and a good shake... Thats a good recipe for muscle growth.