Euryale is not overrated specifically in terms of her damage potential vs Males/her claim to fame as a budget anti-Male nuke.
A 27% charge presents MLB IE/Kscope synergy, which for the purposes of farming is frequently enough to get the job done, no less when factoring in typical supports and her Arts up. Charm’s unfortunately is something of a dead skill when used for melting guys or if you’re just focused on killing asap, but eh.
136K before any other modifiers and easier gauge building - the latter is so important - all alone is plenty fine for the purposes of nuking, and that increases with the more native Arts-based supports you have to support her, such as her in a multi-bar fight against a Male Saber in SW 2 and winning in 5T (granted this is an event with damage buffs, but it’s not difficult to find examples of her getting the job done as needed outside of stuff like that or Onigashima). Considering Euryale specifically always being heralded as a budget anti-Male nuke, anything describing her by those standards is a pretty fair assessment. Appmedia’s actual reasoning is pretty on-point as well. Being able to reach a minimum of 462K with just support Waver, 2K HNS (easy), and 2004’s NP Up drives that point home. Frequently, IME, all you need is a nuke, and if you have that on hand battles become much simpler since protracted battles just extend the risk of something going wrong.
But it’s hardly controversial to say Orion is overall better, which he straight up is. More bulk in an Evade and DEF+, more basic card consistency in a 3T ATK+, more (read: any at all) party support in strongly scaling crit chance down, coupled with a basic ATK down to stack with DEF+, and pip reduction. And considering NP1 Orion hits for 152K at with L10 Punish, if charge is no issue to you (superscope, various 50% + effect pure ATK CE, w/e), well yeah he’s just going to wreck faster while being more consistent and inherently more splashable by not being so hyperspecialized. Offensively, it’s the difference between more consistent eviscerating within the niche (Euryale’s NP always proccing the SE, Orion’s being every 5T), and better spam (Orion’s gen is mediocre even if not Kerry, or Nyanta (without her gen skill up), levels outside their ideal comps, while Euryale’s kit inherently lacks that issue).
True, although I’d place them both in the second-best category myself regardless which makes it something of a moot point when we’re in agreement with the most salient point (raising everyone). Both are widely useful by nature, David’s team support just lends him to more flexibility with when you want to bring him out, even if it’s mostly courtesy of HoH which is silly and wonderful. I feel like it’s telling that the only units DW has ever given such a skill are: Him, Tristan, and Merlin. Wildly useful.