Clamping first, then hanging would be my choice. Think of the tunica as being like a balloon; If you blow a ‘penis shaped’ balloon up (making it more ‘pliable’) then deflate it, it becomes easier to stretch in length.
If you take a new balloon and stretch it first a few times, before blowing it up, it becomes easier to blow up (girth increase).
Slightly over-simplified explanation: the tunica on most men has 2 layers (some have 3). One runs with its fibres longitudinally, one laterally. In some men one is ‘tougher’ than the other, making them easier girth or length gainers. Most guys gain length more easily. Again, think of the ‘penis shaped balloon; as you blow it up, it grows in length relatively more than in girth.
You can use the same theory (and it is only really a theory - the physics works but no specific science has been done on this with the penis!) with stretching and jelqing, as well as with clamping and hanging. However, because most guys find it harder to gain girth, there is still a strong argument for stretching first, if someone is interested in both length and girth gains. If someone wants primarily length, then jelqing before stretching (or clamping before hanging) makes some sense.
Hope that helps.
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Heat makes the difference between gaining quickly or slowly for some guys, or between gaining slowly instead of not at all for others. The ideal penis size is 7.6" BPEL x 5.6" Mid Girth. Basics.... firegoat roll How to use the Search button for best results