Correct sir. Nigthmare is only worth on very rare ocasions if you are in a hurry in an event.
Or if you just reach the cap. Fore example rank1 champions with raid battle will get to level 10 in one nightmare run for 16 energy but in brutal you are missing a tiny bit making it 3 runs for 24 energy or 30 minutes in sparring pit.
That's actually not true at all.
As per https://ayumilove.net/raid-shadow-legends-campaign-xp-silver-guide/, brutal 12-3 is 17304XP, vs 38416XP for nightmare 12-3. That works out to 2.22x more XP at the cost of 2x more energy, or, put another way, roughly 11% more XP.
The reason people tend to favour brutal 12-3 is because it is faster, easier to gear for, and gives more overall silver.
That's actually not true at all.
As per https://ayumilove.net/raid-shadow-legends-campaign-xp-silver-guide/, brutal 12-3 is 17304XP, vs 38416XP for nightmare 12-3. That works out to 2.22x more XP at the cost of 2x more energy, or, put another way, roughly 11% more XP.
The reason people tend to favour brutal 12-3 is because it is faster, easier to gear for, and gives more overall silver.
I think the "value" of green shards, at least for f2p has skyrocketed. I would say farming nightmare is a not a good idea unless you regularly spend real money on shards.