The only point in the numbered series where I’d say you should play a different one first is IX, which plays on nostalgia for the aesthetics and tropes of I, III, and V as a part of the cozy vibe it’s going for with its setting. And note that VII Remake is not actually a remake of VII and thus not a part of the numbered series, being best enjoyed by people already familiar with VII.
Beyond those stipulations, play whatever looks coolest.