DTS vs STS

I’m looking to buy a new car and I wanted some opinions on which is a better value between a 2007 DTS and 2008 STS

The DTS is listed for $2500 and has 296,000km (about 185000 miles). It needs a transmission repair but the rest of the car is in very good condition for its age and mileage.

The STS is listed for $3500 and has 161000km (100000 miles). It needs to have the rear subframe replaced before it’s driveable but other than that has no major issues.

I’m wondering about the reliability of these two options, which vehicle would be more reliable in the long run and what I should expect for maintenance costs since this would be my first time owning a Cadillac and I’ve heard they can be pricey to maintain. I have experience working on my own cars in the past and do most basic maintenance and minor repairs myself. Mechanic shop rates are about $120-140 where I live so both repairs would be quite expensive.