I've got both and think they're both fantastic sets. 6209 does have a more pleasing palette but I think 8097 looks very nice as well. The bright colors don't bother me, though I do understand the criticism.
One quirk with 8097 that you might run into; there is more than one version. I bought a used, incomplete set sans instructions on ebay for cheap. It was partially built in the photos and looked to be about 90% complete. Upon comparing it to the inventories online, however, I appeared to be missing quite a few pieces, about 30%. I also had a number of extra parts, some of them quite large. Off to bricklink I went, where I ordered the missing parts and some instructions. Once I tried to build it, however, I quickly realized that I was still missing some pieces. After about 20 minutes of confusion I found that the parts the instructions were calling for were the pieces I had originally declared extra. I put two and two together, did some googling and found that, sure enough, there was a revision at some point and there are two different versions.
So yeah, just an FYI.