As a professional decorator, I use Dulux Trade Weathershield oil based gloss paints when painting exterior woodwork. Note- there is a massive difference between Dulux and Dulux Trade. The latter is vastly superior but marginally more expensive.
Zinsser Allcoat is a waterbased satin finish. I assume you are asking about the Sadolin Superdec which is another waterbased finish. I haven't used either though.
I prefer the oil based paints because they flow better and with the correct additives they are vastly easier to work with at extremes of temperature. Oil based paints can also be used at lower and higher temperatures. Superdec for example should not be used outside of 25 to 8 degrees and even if you apply it when it is 8 degrees, if the temperature drops below that within 4 or so hours the curing of the paint may be compromised.
Oil paints are also easier to keep clean. If, for example, you get red brick dust on a waterbased satin paint, you will be left with a very, very slight red tint on the woodwork.
Another advantage, assuming that you have a BrushMate box, is that you don't have to worry about washing the brush out at the end of each day.
A major downside of oil based gloss however is that if it rains within two to four hours, the paint may end up with dimples in the finish which are a pain to sand back (given how long OB gloss to cure). Before glossing, I always check my Rain Gauge app. It shows me the forecasted rainfall in 5 minute slots for the next 3 hours.