I have not used dubia or lateralis for my frogs. I have however, the experience of our using them to feed 300+ tarantula.
Of the 2 types, we prefer the lateralis.
Here are my reasons for not feeding them to my pdfs:
1 - dubia will burrow - which makes them very successful escape artists.
2 - dusting isn't as easy as with ffs - these are good for tarantula because the tarantulas' dietary need is for very low calcium.
3 - colonies available are not small, so unless you were to use many, this might not be cost effective.
4 - lateralis will hide behind things and move around a lot.
5 - lateralis take about 3 months to reach maturity. dubia can mature more slowly depending on temperature.
6 - reproduction. Lateralis are harder to breed in our experience. However, for successful breeding of dubia, you would need a large colony - of 3-500 hundred with at least 10 pair of adults would be a good starting colony.
7 - with Hydei, the lifecycle is definitly shorter, more pdf keepers will have these in case you need a quick replacement. Start-up cost is less.
roaches take up more space to maintain a colony.
These might not be a bad food source, but you may want to look at the various factors involved. As with any feeder insect, you may want to note that one source alone isn't the better way to feed your pdfs.