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Trans-X Security (good design)
Any reason you've listed these as being a good design? It sounds, from Amazon reviews, as if the non-hex end is prone to be gripped and undone. Do you know if that end could be replaced with a regular seatpost bolt (with the hex filled in with solder)? My Soma has a tabbed binder hole, so that end doesn't really need a hex key fitting anyway.
Polygon-
These security skewers are a deterrent, and a third level of deterrent rather than Level 1 (u-lock thicker than 16mm), Level 2 (secondary u-lock approx 14mm for front wheel), and the Level 3 would be for parts that can be unscrewed.
Therefore, even the formerly best of all of the security skewers was defeated in the way you're describing. If in a really high crime area, using a ball bearing superglued into the seatbolt fixing, might give more peace of mind. Though it would be a faff to undo.
Better to secure the crank together to downtube or seattube. Ball bearings superglued into vulnerable bits. But essentially, the Tranx is a good design to ward off amateurs.
GA2G
This list will not include rope locks, as they are useless. Primarily this will list shackle locks with a bar diameter of at least 16mm, 18mm being preferable if choosing between either (The exception to this is Abus' specially hardened 13mm steel, which has survived testing that some 16mm steel U-locks failed.).
Other, lock types (armoured cables, and heavy chains) will be listed, but in a different section.
There will be no compromise based on weight or price. Only the best will do.
Best of the best
U-Locks / D-Locks
These are the very best:
These others are pretty damn good:
Chains
Only one is good enough to be considered the best. Leave it at work, or at university, so you can relock it each day.
PJB Untouchable 19mm
A mini-review by forumenger GF between Pragmasis and Almax 16mm chains, shows that they are of similar competence. But the gaps between the links meant that the final solution for GF was a Pragmasis chain with an Ingersoll Extra Closed Shackle. Now, this is the most expensive solution on this thread, but if your bike is worth that much, then this could be exactly what you need.
Cutting time ratios for 11mm 14mm 16mm and 19mm chains - testing performed by @Pragma
Skewer Locks
Solid Axle
Quick Release/Hollow Axle
The full list
Heavy Duty D-Locks/U-Locks (Primary security)
18mm/19mm:
16mm/17mm (or equivalent strength):
Wilson Cycles, Peckham
Chains: 16mm minimum
(Extremely heavy, and will last long enough to put off most thieves, but not indestructible)
Armoured Cable Locks
There are no recommended armoured cable locks.
Alarm Disc Locks
Very useful in shared accomodation, outside the pub, or at university - not primary security.
Alarm Padlocks
Again, nearly essential security in London, but not as primary security).
Axle / Skewer Locks: (additional security, NOT primary security)
For solid axles (ie. fixed gear hubs):
For hollow axles (ie. quick release):
Demoted
Other links