I have the Red Venom compression tights and gradulated compression calf guards and the same in 2XU.
With the tights, I find the Red Venons ones a bit too long in the leg (I'm only 5ft 1"!) and they crease up behind the knees. The 2XU ones are more catered for women and they are definately a better fit. I use my Red Venon tights for recovery and my 2XU for running.
With the calf guard I don't really have much advice, I use them both. If anything, I think the Red Venon's are tigher than the 2XU. But I only use them for recovery.
Overall, 2XU products are a better quality but I think that is what you are paying for. However, I have broken a pair of 2XU tight after approx 9 months, but I sent them back and got a full refund.
Hope this helps.