I have 3 type of tarps, highlander basha, DD 3x3, British military basha
Here my verdict
The British army basha
It is a great size of 8x7 and is plenty enough for 2 people to sleep under, they are built to last a very long time and probably the strongest of tarps as they can be doubled up as a stretcher. The downfalls of the this kit is its made from a slippery material that is annoying to fold and pack away neatly, so the best thing to do is stuff it in its sack and deal with bulk & not to forget to mention its heavy.
The highlander basha
Is one of my most used shelters and I love the thing. Copper_head mentioned its like the web-tex one, that is correct the size and design are pretty much the same but the highlander is not made from rubberised material, it's made from a waterproof ripstop and weighs next to nothing 450g, it can be folded and packed down to the size of my fist, perfect for one person in a hammock or on the ground. It also has press stud buttons on it so it could be folded over into a bivi or to attach another highlander basha to make it bigger, I bought 2 to try this out
Downfalls, because of its size that limits how many ways you can set it up (unless you attach two together as mentioned) its plenty big enough for above hammocks, A-frame on the ground and lean to's.
The DD 3x3
Iv just bough one of these and not had a chance to use it. From what I can see it ticks all the boxes for a bushcrafters needs, it's made with care and good quality materials, it's big enough to be set up in so many different configurations.
Downfalls it much heavier and when packed down bulkier than my highlander, but NOT as big & bulky as the British army one, so at least the DD can justify its weight and bulkiness due to the size of tarp you are going to get when you unpack it.
So if I want to travel light and fast, the highlander is my choice.
If I want to be more comfortable at a fixed camp for a few nites the DD is my choice.
If I'm carving in by back garden or one of my friends need a tarp to lend then that's where the British issued tarp in.
I hope helps anyone