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They're both triplets and you'd need to be a very experienced imager to get better results from the 130 versus the 120. The 120 is also quite a bit lighter than the 130.
Respectfully though, if you're needing to ask these questions I honestly think you'd be best to start with less expensive equipment and ease your way into the quite complicated field of Astro-imaging.
For example, you could get fantastic results with a Skywatcher Esprit 80; the short focal length of this high quality apochromat would be much easier to build experience with. The Esprit comes with everything you need to get started - great lens, good focuser, field flattener - no need to figure out which flattener/reducer to buy and which adapters to use them with.
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