Compared to the Attack set from Season 2, Season 3's gear is good with a broad range of Heroes. Regardless of how it rolls, Level 88 Gear is extremely powerful, so rolling into the substats will only dictate which Heroes make the most out of the equipment.

Overall: Speed set gear is almost universally useful. Some DPS heroes, almost all healers, and most utility units can all use a Speed set. However, hard DPS heroes that want to stack Atk (burns/bleeds/Sez/Gunther(???)) or Crit Damage usually do not want to use Speed sets (exceptions: nukers like Cidd, Vildred, A.Coli, A.Cidd who benefit from going fast and scale with Speed, or weird hybrids like Baiken), and neither do most bruisers. Many tanks do like Speed sets. HOWEVER, level 88 gear is very powerful and worth considering to use as a broken set depending on stat rolls. This analysis will consider 5 main roles:

Hard DPS: Your cleave unit or primary single-target DPS/wallbreaker, who wants to stack Atk/Crit/Crit Damage (E.g. Luna, Cermia, C. Lorina, A.Vildred). SOMETIMES build Speed sets but usually focus on damage sets.

Healer: They heal and sometimes cleanse or buff while doing so. Usually (but not always) heals are based around the healer’s HP, sometimes based on the target’s HP, and rarely based on the healer’s Attack or damage dealt.

Utility: Sometimes overlaps with healers. Provides buffs/debuffs, cleanse effects not tied to heals, and other strong effects like revives and dual attacks or CR pushing.

Tanks: They eat damage for your team and often provide defensive buffs/effects to allies or crowd control enemies. Sometimes overlaps with healers for tankier Soul Weavers like Destina and Angelica in PVE content.

Speed Nukers: Speedy units who like to either pick off a target ASAP to start a fight (A.Cidd, A.Coli, Baiken, Cidd) or want to output constant, fast DPS (Cidd, fast Vildred builds). Sometimes get damage scaling based off Speed as well.

Since bruisers (moderate damage high health/effect resist fighters often based around outlasting squishy foes via lifesteal or counters; e.g. Ken, Ravi, ML Ken, Violet) very rarely run Speed sets, we’re going to largely ignore them for the purposes of discussing this gear. If a gear rolls high into HP/Eff.Resist you can use it as a broken set for a bruiser if you like.

All of this gear is extremely powerful and worth leveling to +15. Determine who you want to use each gear depending on the substat rolls you end up with.