This is very true. On the Nutaku side, two things were happening. If I wanted to, I could get the rainbows I wanted with the more frequent deals so long as I wanted to spend the cash for them. While I certainly appreciated my rainbows, I never got to experience that "special" feeling of satisfaction of THIS rainbow being the one I earned through luck on the gacha rolls. The 2nd was that golds are so much more frequent. It would easily be pull 3-4 golds on Nutaku's gachas every time. I ended up having so many golds, that I began to get overloaded and backlogged on who I wanted to use and level up. So both of these factors did kind of diminish the enjoyment.
On DMM however, I finally earned that special rainbow and, with hearing how rare rainbow deals come, I fully treasure my Anemone more so now. On top of that, I am getting less golds on the gacha, which allows me to focus on them more as well as enjoy them. So in a way, you could say I am getting more fulfillment on the DMM side. However, as others have said, deals or getting golds at such a low frequency could become troublesome eventually if I am at the point of having maxed out everything. Basically, I don't want DMM to become to "famine" to Nutaku's "feast".
However, I am eagerly awaiting any potential gold ticket deal. Because if I don't get lucky enough on the upcoming reissue to gacha roll for Tiger Lily, I am going to get her through that!!! She is totally the 5* waifu I am looking forward to.