I like their chicken soft tacos and most burritos, particularly the spicy chicken burrito and epic burritos. Their queso is good for FF queso, and I add it to lots of items. An interesting secret menu item is the bun taco, which is kinda like a sloppy joe with taco ingredients. Or going "bold" which means adding fries and secret sauce to any item.
The OG location in Barstow (Del Taco #1, but actually the 2nd location after Yermo, which closed long ago) is supposed to be incredible for FF, but I haven't been.
Del Taco prides itself on quality for FF, by chopping, slicing, grating, and grilling their ingredients fresh in each store. The CEO says they emphasize "quality over quantity", and claims that "We have the value and the affordability and the speed and convenience of a traditional, fast-food, drive-thru restaurant, but we bring and pair that with quality and value that you would expect from a fast-casual restaurant under one roof."
https://www.cnbc.com/2017/08/29/del-...ado-costs.html
https://www.delish.com/food-news/a49...bout-del-taco/