I just had this same debate. I ended up going through LLL because they had theirs discounted and i was able to order a Ficus tree as well. The nice thing about the LLL is they have the removable bottom, which i've heard DIY doesnt.
LLL. You can open the bottom to clean easier but the top 10-12 inches in the front is screened off. This is how the cages used to be I am not 100% sure how they are now but if they changed the front to a full door I would go with them
DIY. You cannot open the bottom to clean but the top is not screened off. You can probably mod it though to be able to open it up. I have one for my outdoor cage and was going to do this but my nephew kicked a hole in it so I ended up building a new cage for inside.
I like DIYcages.
They DO open on the bottom. You just have to remove the two screws on the very bottom of each side.
They are very sturdy, and worth the money.