Upload & Sell: Off
Between Aluminum (Al) and Carbon Graphite (CG), I will take an Al anytime.
Between Flip Lock (FL) and Grip Lock (GL), I will take a GL over FL.
Here is the reasoning:
Even though CG is much lighter than AL, but is not by a large margin if one consider that only the tubing are involved and the rest of parts are still make with alloy. But the cost for CG is almost double to triple of that of AL.
The next thing is stability, AL is much, much more stable than CG all due to its disadvantage in weight. Because it is heavier the overall center of gravity is lower when the system is mounted.
I almost have my 5D, lens and everything that was mounted blown over on its side and over a cliff in Australia just because it is top heavy.
Ever wonder why Geo-surveying system never ever use CG tripod instead of the usual solid double shank wooden or alloy tripods? Again stability, CG tripod will flex just like fishing rods, although in a much smaller degree, but still flexes!
Do you mean weight is not important to these guys, where CG was here since after WWII?
Now, lets switch to the locks.
FL is much faster to activate than GL, but FL will slip over time while GL can be further tighten.
If one disassemble a FL, one will notice that what actually create the friction is the plastic or rubber parts, but these parts can decompress and wear off easily. Once it wears off there will be very little friction and the tripod will tilt over especially with CG which is smoother base on its material.
But is GL better on CG tripod? Yes and No. It is better when it is new, but over time when one over tightened, the graphite rods can easily be fractured, decompressed and becomes useless. CG is good for its surface tension or stress property but not for compression.
GL on AL tripod will be different because there is no way one can over tighten to fracture the AL tubes. The only thing needed replacing over time is most probably the ring sleeve which we can substitute easily with a thing sheet of plastic or tape.
Now! You can go decide how you want to spend you dollars.