I think some of this depends on application?
The GM v6s have seen marine duty, which is a much more strenuous application than a car. Same with the honda v6 which spends its time up on-end in honda 4cycle outboards.
To be truthful I'm not sure I've ever had a v6 I didn't like.
Nissan V6 out of our 97 pathfinder was a little quirky to work on but towed well and was a smooth performer. It always smelled of antifreeze and required top-off every 6 months, WP never failed.... porous aluminum? but day in-and-out reliable.
Honda v6 in our mdx is t-i-g-h-t and is a screamer and well more power than the vehicle needs.
I've lived with a 3.3 chrysler for 4 years and on year 2 with a 3.8. Neither have given me *any* problems. I towed several times over the limit, in the mountains, with the 3.3 and it was solid. The 3.8 is even better. If the 3.8 is thirsty, that's news to me. it outdoes the 3.3, and I can get 24-26 mpg in the town and country with it.
I would rate all of these above the chryco 3.7. It was tappity and had weird vibrations from it, though did decent on gas and put up with being flogged off-road and some trailer duty.
Honorable mention to a chryco 3.5 I lived with for 6 months. Dual intake manifolds, TBs and dual pipes and cats to the single muffler, that engine would absolutely scream and had a beautiful sound. The car around it, however, was falling apart.
If I had to choose from only my own experiences, it'd be the chryco 3.8, or the honda/acura. (that said, there's a 4.7 toyota 8 in the driveway that is in an entirely different league...)
LOTS of good offerings out there! I'm not partial to timing belt or chain now... both have pro's and con's, and TB maintenance is so infrequent it doesn't bother me... and I've seen enough chain guides go bad over the years... so they even out.
