Looking the Pfitzinger plan he is doing a Vo2 max workout 6,4,2, weeks out. They were 600 meters at 5k pace. He has a lot of tempo stuff at the 7th and 5th weeks out. He has 16 mile marathon pace run at 6 weeks out. He also has races 4and2 weeks out of 8-15k which also works as higher paced tempo. Daniels throws more tempo and race specific things into the mix. The weeks the Pfitzinger plan has Vo 2 max workouts which only translate into 3000 meters but there are also races scheduled in those weeks . Both plans are similar in a lot of the basics. Daniels has tempos every week no racing. Both guys are highly respected Phd’s. The Hudson plan has workouts focusing more on half marathon and marathon pace the last six weeks similar to Daniels. The Pfitzinger plan has you racing more which may give you a bit more motivation and have you. My thoughts are that you are seing results with the speed workout so a hybrid program which Pfitzingers looks to be maybe what you need to use at this time. Look there is no right or wrong here. Execute the training and adjust when and if you need to as well as listening to your body and you will see results. Racing a bit more is fun and allows you to achieve some times which does not put all of the training eggs in one basket. This way if you get a few PR’s along the way and the weather turns ugly on Patriots day which it can do you achieved PR’s or had fast races along the way. You also may need a change from the daniels plan as after a few years you learn to become better at specific workouts and may not improve in races.