Take a look at both and decide from there, using bills etc. Clearly you have worked on your cars too. Hear that knock etc? Think of what it can entail. I wouldn't despite what some say get hung up on mileage either.
I'd give you a couple of examples but I'd simply send all here to sleep

.
In short, in 2009 I bought a 120k 1989 S2 with tons of bills and a recent respray. Over the next few months I did the following:
-New engine (it would be the third engine the car saw in its life after further digging)
-New belts
-New Clutch (old rubber centred item)
-Lower arm (PO only changed one side for a secondhand item) & Castor bushes (they were horribly perished!)
-Heater Matrix
-Almost all of the cooling system (rad, thermostat, pipes etc.)
-2 new tyres (all of them were around 10 years old)
That was spend in 8 months, with me doing everything bar the engine fitment and cambelt change.
If I am honest it still wanted 2 new tyres as the P6000s were old and low on tread as well as dampers all round.
The second one was a 170k Turbo bought from a very well known and revered specialist in the Heart of England. That was tasty including:
-Ex Pro-Max Motorsport Andrew Sweetenaham car. He bought it at 150k and from what I can tell drove it alot!
-Good interior bar the clock not working and a ripped driver's bolster with the Sports seats. The dash looked like new!
-New sills and wings, but the rear arches wanted a bit of attention as they were beginning to rust. I sorted this.
-KWV3 suspension with Hartech arms, Poly ARB bushes, M030 ARBs, 968 castor mounts, subframe mounts etc.
-Big Black Brakes with matching smoothed calipers on the rear
-Rebuilt head and an engine that never dropped below 4Bar Hot at idle.
-AOR LSD gearbox with I suspect a rebuilt LSD ; it could be vicious!
-New PAS lines
-Cup 1s with Michelin PS2s all round
I didn't struggle to sell my first 944 but I did the second with the mileage IMO putting people off. TBH I was almost put off but the specialist did vouch for the car. However, it was a better drive by tenfold, and did around 12,000 miles in my ownership where I:
-Repainted parts of the car when I did the rear arches
-New clock repair kit
-Seals here and there (sunroof)
-2 New tyres after 5,000 miles covered.
It's the one car I am still a little gutted to have sold and in hindsight I sold it for a stupid reason ; to fix my low mileage Stag which needed yet another gearbox very soon in my ownership.