I would buy the one in the best condition, or a color I liked if they are different. The thermometers are not very accurate on either one so that wouldn't be a factor to me.
Also the plastic tables get weak after many years in the weather. So maybe the newer one is better? I have seen many with cracked tables. I bought a black one for $25 with a cracked table. If I need to lift the castor side to move it over a bumpy area, I made it a habit to grab the metal front legs when picking it up instead of lifting it from the front edge of the plastic table.
$200 is too much for me unless it was a color I really liked and was in great condition. I have seen many deals for less than $100, so don't buy the first one you see.