As you can see, the suits are practically identical except the original is solely yellow and red, while the MCU suit is mainly red and blue, with some gold thrown in there for tribute, I suppose. The MCU Iron Spider has 4 legs while original has 3 legs.
As for which one is better, I'm going to have to go with the design of the MCU Iron Spider.
MCU Custom Marvel Legends Avengers: Infinity War 6" Iron Spider
The figure are painted with metalic red,gold, &darkblue color,also the light up eyes.
It features the mechanical arms that had to drill the holes that not to close to impact on the butterfly shoulder joint. The color of Spider-legs was inspired by Iron Spider in Spiderman PS4.
Lastly, a newly developed in each web-shooters sculpt and specially hand-painted.