I prefer magic/power systems with a range and a level of uniqueness to the characters. One of my favorite examples of this is the Nen powers from Hunter x Hunter.
In my comic, there are a few layers to the magic system and it's broadly categorized in strength and difficulty based on the military ranking system (it takes place during a war and the MC is a soldier, so it makes sense in practice). There are 5 ranks with the lowest being D-Class then C, B, A, and S-Class at the top. Along with other aspects of a soldier's fighting prowess, magical ability helps determine the soldier's rank. Spells are activated using the sorcerer's energy and a set of words in a language loosely based on English/Spanish/Latin. The energy a sorcerer is able to use at any given time is limited, and the sorcerer can become physically exhausted or even go unconscious if they exert themselves to their limit, but it also replenishes over time. Each sorcerer has an affinity for a specific element (or, very rarely, two elements for a dual affinity). The most common are water, fire, wind, and earth (classic four elements style), but there's also rarer ones like metal or blood.
At a certain level (around B-Class), sorcerers are expected to contract with a familiar to attain higher levels of magic. These contracts are bound with a verbal agreement and a physical mark on the sorcerer resembling a tattoo called a Familiar Crest and last for life. The sorcerer has to train extensively to unify their magic with their familiar, but the payoff is definitely worth it. The ability to tap into another source of energy is useful enough, but someone highly in tune with their familiar can create armor and a weapon that enhances their abilities. For example, if a sorcerer uses water magic, their armor could allow them to float effortlessly, breathe underwater indefinitely, have perfect sight underwater and, of course, greatly enhance their magical power and energy.
There's also ancient magic, which isn't used much in their current societies. That magic uses magic circles and was more ritualistic. It's more permanent and potentially more powerful, but unless a spell had been absolutely perfected it's more volatile than it's worth to risk it. Not to mention it's time consuming and impractical for the military's use of magic in active combat.
This was so long, geez.