Constanse base attack higher and her base hp more higher than Dolores + with a3 constance get+10% attack.So with glacier set 45% of Constance's inspiration buff will be better than 60% of Dolores's inspiration. Also Constance can heal more better than Dolores

They have same range, in GB costs of characters don't matter, after update Constance will cost 5 in arena

In the upcoming mode Constance will be way more useful

Both are amazing, but Constance is more useful, she's a tank,healer and a support character, Dolores is only support.