So the first one is AR-15A4 and has a rollmark Lightweight LE Carbine Ser. CarXXXXXX. Upper receiver is C with a keyhole. It is new with box but I don’t know what model this is or what it is worth.
Other one is a LE6920 with stamped rollmark M4 Carbine with LExxxxx serial number. Upper receiver is C with a square. It is new with box and seller is asking $1,095 but I can do layaway which helps me out cause poor.
The carbine with the AR15A4 Lightweight LE Carbine rollmark is an AR6720. It has a lightweight barrel profile. Some came with detachable carry handles (early production) whereas older models came with Magpul flip-up sights. These are not seen too often on the secondary market these days and are out of production.
The LE6920 is priced very well at the price you quoted.
That is a tough call because, in my opinion, neither carbine is rare enough to be considered an investment. Having said that, if I had money to spend on one, I would probably get the AR15A4 Lightweight LE Carbine because they are the least common of the two options.
As additional support to that thought, Colt has the CR6920 on the market now at prices as low as $750. People wanting a general purpose LE6920 have options. There isn’t a current Colt market equivalent for the AR6720 and there probably never will be so you have gradual value appreciation on the collectors market.
Ultimately, you have to decide what your goal is with the purchase (collectable, recreational firing, etc).
As a collector, I like the AR-15A4 Lightweight LE Carbine rollmark and am glad to have a late production, new in box example in my collection. That is what I would buy if I was in your shoes. But, as stated previously, don’t let my preferences override what your interests are in the hobby.