Any one switched from Intuniv to Strattera?

If so, is it worth switching?

Also,in lot of places online it is mentioned that intuniv works best for kids and teens below 17. Is it true? For context I am 32. I have been taking Intuniv 1 mg from the past 4.5 months and gained 10-15 lbs. could it be the cause?

Any help/suggestions in this regard is appreciated. Thank you!