I do currently own either model of the Galileo Shuttlecraft but built the older one, long ago.
Things usually get very messy when trying to discuss the accuracy of a model based on a movie prop or rendering. In the case of the Galileo Shuttlecraft, there was at least one prop used for filming, a full scale prop for exterior ground shots, and an interior set. They differ in details so which is correct? Matt Jeffries, who designed the thing, also made many comments about the size of the Shuttlecraft. Is he right?
For the newer Shuttlecraft model, the designer scaled the vehicle to fit the interior set with the caveat that the interior set had very high ceilings for filming. He based the exterior dimensions on the full scale prop for exterior shots. If the figures for the newer model are 1/32 scale, and the interior props are to scale with the figures, then the Shuttlecraft must also be 1/32 scale or very close to it.
I have read reports that the new model decals have some accuracy issues in terms of Shuttlecraft names versus numbers. Browsing the original series episodes involving each possible Shuttlecraft will confirm or refute these claims, but I have not done that. I cannot write anything about the quality of the decals themselves. Based on pictures found online, at least some model builders have succeeded with them and produced very nice models. 
If your want a Galileo Shuttlecraft in your collection, are not extremely concerned with accuracy or scale, and are willing to replace the decals if necessary, the new model is far superior to the old one. It matches the full scale, exterior shot movie prop far better than the older model. I do not own the kit and cannot offer an opinion on the quality of the molds. I am more demanding in this regard than many science fiction model reviewers, probably because I also build 1/35 scale armor. If you insist the Galileo Shuttlecraft was a certain actual length and will be disappointed by an incorrect model to that length, I would make some calculations before purchasing anything. If replacing the decals will push the project over budget, I would gather some decal reports from people who built the newer model.
I recommend reading online reviews of the newer Galileo Shuttlecraft model and looking at the sprue shots before making any purchase decision. In my opinion, the model itself is significantly over priced and making the interior an expensive upgrade was sleazy. With regard the latter statement, my advancing age is probably part of the problem. I still remember the older model selling in Woolworth’s for $7 US.
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With regards the Eagle…it gets very complicated. The prop dimensions and sets are all over the place. In Season 2, whole sections of the interior set were removed. I want a 107+ foot Eagle.
For that one vehicle I will very probably never be happy unless I draw, render, and digitally print the ship for myself.