Here's a link to the nutritional value of Black Soldier Fly.
https://kimmyfarm.com/en/nutritional-value-of-black-soldier-fly-larvae
It seems a fair average from the others I've read. Note the 35% Fat.
This is an average fat content taken from a commercial feed. 3.6%
Roughly the BSF give
10 times the amount of fat the feed experts have worked out a chicken needs in their diet!
I'll let you search for information on meal worms.
For dried meal worms the numbers are even worse with some brands.
I can't say how carefull you may be in measuring the quantities of meal worms or black soldier fly you may give to your chickens. Maybe you'll try for the much publicised 10% treat rule. Would 10% be by Volume, or by weight. Every day or just some days. Do you know how much your chickens eat each day so you can calculate what 10% is?
I think most people just chuck a handfull on the ground.
If your chickens free range then they'll get some excercise and burn some of that fat. If your chickens are confined then burning off fat is rather more difficult.
Yes, your chickens will probably love either option much like we like sticky buns and chocolate. Unfortunately what we like is often not what's good for us.
I won't feed chickens either of the options. I would rather feed cooked white fish or similar, or better still let them forage for their own treats.
https://kimmyfarm.com/en/nutritional-value-of-black-soldier-fly-larvae
Here's an inofrmative old post on bug nutrition.
https://www.backyardchickens.com/th...worms-red-wrigglers-compost-worms-etc.837491/
Notice that live bugs that are likely to be found foraging have a much much lower fat content.