Well in terms of gameplay only, Nero bride probably offers the greatest value since she's so versatile.
Currently Mordred is pretty much just a slightly better Artoria with a very niche NP effect. Altera is better than both of them at the same thing. However, way into the future (very recently in JP), Artoria gets her third skill replaced with a 30% NP charge which is pretty useful and arguably makes her better than/on par with Altera.
Other good saber options to consider are Musashi (buster ST) and lancelot (4 star arts-crit machine).
That said, if you really like Artoria and Mordred, there's no reason not to use them. They aren't the best, but they aren't unusable either. Any weaknesses they have can be compensated for with strong support. Nothing in the game is hard enough that you need the BEST servants to beat it.
The advice that most people give is to roll for and use the servants you like most.
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