[Fyron]

As I said before, there is no "best" mod for SE4. It is all dependant upon what you like.

But since you asked about Adamant... it is a monster that would be too hard to try to define in a single post. As Alneyan said, there are 3 race paradigms you must choose between: Physical (normal mechanical and technological race, similar to stock SE4), Organic (advance through evolution rather than scientific research, utilize living, sentient vessels and such), and Magic (who are at a psuedo-medieval tech level and have forgone technological advancement, instead choosing to develop potent magical capabilities). Beyond this, there are many, many efforts at increasing the strategic options available to you the player, leading to a deeper, richer, often much more complicated play envirnment in which hopefully there is not really a "best choice." This has lead to the incorporation of ideas such as many more choices for racial traits, much more balaned racial characteristic costs and limits (aggressiveness and defensiveness max out at 10, with Berzerker culture giving only +5% space combat bonus, but having massive penalties nearly everywhere else, for example), QNP (mass based movement speed), leaky armor, leaky shielding, engines being split into two component types to separate the movement and supply abilities ("engines" and "reactors"), large changes to resource costs so that overall their use is more balanced than in stock, where 95% of what you use (unless Organic race) will be minerals, extensions to various tech trees, the elimination of stock scale mounts for weapons, replaced by a slew of mounts that all have benefits and tradeoffs, rebalancing of the weapons, etc, etc, etc.