I like Delta a lot and use 100 / 400 as my main (almost exclusive) films.
However, let's not turn the thread into a "my film's better than your film" debate (I know we're not there yet, but it's a quick trip down a slippery slope! ).
Both are manufactured to a high degree of quality and consistency, each utilises new technology in their production, and each has their own qualities and characteristics.
The best advice is probably to try a few rolls in combination with a few of your favourite devs and see how they suit you. (Sounds like a fun weekend if nothing else!)