I have Frida at +7 talents, with no plans of going any further. In my case, I only have Thorne at 3-70, but I’ve been devoting Paladin emblems to Guardian Falcon instead of continuing to increase Frida.
To my way of thinking, going past +7 talents for a 5* is excessive in terms of emblem cost. I can do so much more with those emblems on a 4* when a couple more points would do very little to change my Raid Defense - which currently only dips below 2400 if I raid up into the Top 100.
By comparison, putting emblems onto a 4* (to +18 or so) or even another 5* up to +7 would give me more war depth, which is always helpful.
For the basic question of Frida or Thorne, the answer should almost always be: FRIDA!
I have my own decision coming up before too long… I have Thorne at 3-70 and Magni at 3-28. I have mats to ascend one of them. Common consensus seems to favor Magni as the better overall hero… but when I take out Frida+7, Grimm+18, and Thorne at 3-70… 10 blue tiles wipes three enemy heroes off the board. Though I have found sometimes Frida+Grimm kills the middle target, so my attack with Thorne has to go off to another target… and I wonder if perhaps Magni will be better and clearing more in that situation. I’ll test it more once he gets to 3-70.