According to the website, Arabella is 4000sf lot on average. Portico is 3200sf lot on average.
Portico (2167sf) and Arabella (2007sf) start at about the same square footage to about 2400sf.
Either way, the lots are not large. Personally, I’d rather have more living sf for the price. It depends on location, you can compensate by buying a corner lot. Privacy wise, Portico might be better because they are alley homes so you don’t have rear neighbors looking down upon you. If you don’t care about a back yard lawn and can do with a nice patio, then an end unit at Portico might be best.