I would go with the subaru or an audi. Both are deals when bought used because...let's face it...people overlook subarus.
I would not get an E30 iX. Most of the drivetrain is iX specific, even manual/automatic transmission specific... Ergo, while parts for every other E30 are ubiquitous and cheap, it's extremely hard to find iX replacements at a wrecker.
If it were my decision, I'd buy the subaru.
best, whit