Hey, Ray,
It all depends of the child and your program. I mean, if your little one does nap during the day, or does get tired quickly, plus you plan on half-day or full day trips, a stroller would be a better option because of that reclining feature plus the better coverage against the sun. Personally I would advice the Joolz Aer btw, more spacious for a 2yo, and not so crazy slanted as the Yoyo is.
If your kid is, however, happier in the trike and does not really nap during the day, then the thing that he lasts longer and happier in is better, thus the trike would make more sense then.
Personally, I would probably be more for a stroller, but really, what the child stays in happier is the better option.