In my opinion, the only reason to get the LT240 is if you want to add the GPU to the loop sometime down the line. For most people, the H100i or any other 240mm AIO (if your build needs a 240mm AIO) will be just fine and will be easier to work with. Plus, the pump on the LT240 is the same pump people have been having problems with in their custom loops, so I would personally go with the corsair as it is more reliable and has more features.
I have the LT240 and am very happy with it. Temps and compatibility are outstanding.
Materials like the copper rad are good, and spare parts are available so that I will be able to use it for years and in different builds...
That being said I bought it for 55 euro which made it attractive in my case and had to swap to tygon tubes with new connectors and new coolant.
I knew this beforehand so not really a problem.
That made it more expensive and a hassle you wouldn't need to deal with with a aio like the H100i.
Since I wanted to do a direct die build with liquid metal the copper plate on the pump block was preferred.
Ultimately my motherboard prevented me to have it as I wished. The direct die guard didn't fit because the caps would hit the pump block.
Filling the damn thing without bubbles was time-consuming and really a two man job.
Do I recommend it. No not really, unless you know you want a copper rad with upgradability and that is rebuildable but have no need for leds.