Ok... I can answer some of your question...
I finished a rad140 and MK-677 cycle a little more than 4 months ago. I gained 12lbs from it. And I kept everything. I was getting ready to do another then found out about anavar. That led me down the online gear rabbit hole. Then I found this place. Thanks to these fine gentlemen I started my very first 300mg test e cycle exactly 2 weeks ago today.
The reason I made the switch is 1, test is cheaper! It just is, people want crazy prices for sarms now. 2 I could actually find gear from a reliable source. And 3 its safer! I know what everyone says about sarms, its safer, less of a strain, all that. but the truth is they really don't know. It hasn't been around long enough.
I can tell you I feel way better on test than rad140. My libido is through the roof, my endurance is up better than it was on rad. The only thing I ever noticed on rad was slight aggravation. Just at little things. Test is a whole different world! I've gained 7lbs already (but I have been way more focused on my diet since I started)
I have a whole 50ml bottle of rad140 that I'll probably never use, or maybe stack it with a later cycle.
Because I'm only 2 weeks in I can't really give you anything else.
All I can say is it's a whole different world, minor league vs major league. Ibuprofen vs morphine.
Now how different will my gains be? I don't know, I'm assuming a big difference. The way I feel, the endurance it gives me, you really can't compare the 2.
I honestly don't think the rad140 has "lowered" the affect the test has had on me. They are 2 totally different compounds. Plus test isn't something you really build a resistance to like most people think.
People who do 150mg a week for trt wont need 300mg in 4 years to get the same results.
But you definitely asked a great question, curious to see how guys with more experience respond.