Would like some advice on 2 person lightweight tents i have another trip coming up and a bit confused as to shape size make etc any advice would be very welcome.
Tent buying can be a complex task. First, you should decide on price point. You start with low end beach tents that can be had at wal-mart for $39. The have tarp floor fiberglass poles & tiny flies. The are not dry in a deluge and the poles will shred in a few years.
Next you have the mid range stuff like cabelas & eureka. You should get decent aluminun ploles & a full coverage fly. Usually, with well sealed seams, they will be dry, but they won't be the lightest or most compact.
Then you come to the high to top end makers (Marmott, Sierra Design, Mountain Hardware, Bibler, MSR, Big Agness and more ). These are made with the lightest and best materials and have the latest designs. If you are going to use the tent a lot, I would go high end.
Next you should decide what you require for space inside the tent. As mentioned, a three person can be way more comfortable for two people than a two person. If you plan to keep any significant amount of gear in the tent and two people, you'll need a three man.
Next, you may want ponder what you really mean by lightweight. The lightest of the light tents strip away a lot of convenience & comfort features to save weight. Also, because of the use of esoteric fabrics to save weight they can be much less durable and require greater care. Finally, many ultra lights are not free standing (requiring stakes to be set up). I would never buy a tent that is not freestanding. In addition, to requiring stakes, once pitched, they can't easily be moved and are harder to get the dirt out after a nights camp on the beach. That said, even a freestanding tent should be staked whenever possible.
You should also consider how strong a tent do you need. 3 season tents work for all but the most vicious of weather. 4 season tents, if properly pitched, can handle a significant storm on Denali. 3 & half season tents offer features like zip up windows for cold weather/privacy and some extra tie down points.
Were it me, I would trade off a few oz's for some convenience features. Double doors and vestibules (dry storage outside the tent) are very nice with two people. A little more nylon vs mesh offers way more privacy when you don't use a fly.
This would be a deluxe 2/3 person super light compact moto tent. Double doors. Three person space, pretty good privacy & super light 4.5 lbs for $500.
It'd be my first choice.
This is among the lightest 2.3 lbs: