Commuting - Help with a decision please

So here is the issue I am faced with. I typically ride a Schwinn World Sport, that I took down to the frame, sanded and repainted and rebuilt with mediocre parts, aluminum rims, standard stuff, nothing amazing. But it rides great and gets me everywhere I need to go. Frame is really the only Schwinn part now, is made of 4130 Chromo, double butted.

Now, yesterday I came upon an amazing deal on a Bianchi Sport. Made in the late 70's to early 80's I would guess. Likely an asian model of Bianchi's. No stickers indicating anything about the frame tubing or the bike. The downtube shifters are Dura Ace, but the derailleurs themselves just say Shimano. The Brakes look like 600 series, as best I can guess. This all being said, the bike is purple/pink, but otherwise great condition. Large chain stays.

Which would be the better to keep, as I will sell the other. I commute a alot and am thinking of making longer rides in the near future. Are the oversized chain stays a positive or negative?

Or, if you know something about the Bianchi that I do not, that could also help make my decision.

Thanks!

You should post this in the classic and vintage section for some really good feedback. The bike sounds like a Japanese Sport model which was a touring model hence the longer chainstay. The should "technically" make it better for commuting as the geometry is designed to carry a load. Sports from a few years used Shimano Exage equipment. I am not sure about those Dura Ace. The concern would be that the parts have been replaced although no big deal if the parts were OK. The Sports model was not top of the line but had decent enough parts that worked well. If it was Celeste colored it would be a no brainer for me. Either way ride them both and see which one you enjoy more. Value wise the Binachi would probably sell for more than a stripped and repainted World Sport with non-original parts.

What Johnny Alien said, especially the part about riding both and seeing which feels better. In the "end," that's what counts most. Just be sure you ride them long enough (not just around the block) to get a true assessment.