I'll just assume each look like they just left the showroom floor and that each is in absolutely perfect condition and spare you the now cliche, condition, condition, condition discussion.
Stingray is a budget boat in every class it is manufactured. Their hook of course is their hull design allows you to go faster with less power but at the expense of ride quality and generally the fit finish and materials are on par with the low price point. So for example while my 24 foot boat goes just under 60mph, I can tell you that I rarely go wot long but appreciate its ride quality every single second. So I'd take a slower boat but one with better ride quality which would put a Stingray off the list ignoring the lower quality interior than I'd be interested in, in the first place. Bluntly then, a 3.0 would not meet the lowest expectation and so would be a non starter as well. The 4.3 is massively more powerful than the 3.0.
The Sea Ray then is almost an orange compared to an apple as it, if my recollection is correct, is still a 90's design hold over meaning wood floors and glue down carpet right before they went to modern construction of fiberglass floors and less wood. I'm not comparing to the Stingray here but just the fact that glass floors started to be the norm in the early 2000's.
If I were you, I'd be looking at something as new as the Stingray but something that isn't Stingray ride quality. All that said, I would take the Sea Ray and its 4.3liter.