Unironically the best space mod for 1.12.2

Warpdrive is probably the best mod for modpacks due to how highly configurable it is. Unlike Galacticraft and Advanced rocketry where its just Select Destination, Press Button, then Go To Another Dimension you can build a fully custom starship and jump it around space. However, its not a mod that can just be tossed into a pack and used. While it does have an automatic config file for use with Galacticraft, any other dimensions would have to be manually added. But all in all as a modpack creator it is worth it.