someplace warm to temperate, with mountains on the east coast of a land mass.
they should be more worried about access to wood, metal and coal. survival can be done in a lot of places, but not everywhere has abundant resources for tools. You plan for the long term or risk dooming themselves to technological stagnation. many places ran into limitation due to limited access to timber or or metals.
they also need to worry about water, since they will not have water purification, so you want someplace with abundant ground water so they can dig a well.
If you are using actual earth they should land where domesticable plants and animals are. A place that is good now but also good for their future. happily such places that also have abundant food exist, Anywhere you have mountains on the eastern coast of a continent that is fed by prevailing wind from the ocean.
(image from https://globalplantcouncil.org/)
All in all the eastern US or coastal China is your best bet, lots of rivers and rain, abundant forests, mineral deposits, and abundant food. What do these two places have in common, a temperate to warm climate combines with lots of mountains on the eastern coast of a land mass, which means lots of rain and lots of exposed mineral deposits. which means lots of river, high grade soil and thus lots of food.
The US used to have lots of American chestnut trees, which was fast growing, produces excellent timber, and produced so many seeds it was incredibly easy to farm and produced literally tons of food. enough to support humans and abundant wildlife in their ranges. Even better since they drop in the fall they provided abundant food exactly when it was most needed. (to the point it may become the first genetically engineered organism purposely introduced to the wild with the intention of breeding in order to bring it back)
without humans the US would also still have horse and camel species, as well as a slew of other animals that might be domesticable if they can resist hunting them to extinction.
Alternatively china gets you basically everything the western US will get you plus pigs and water buffalo, so you get a leg up on domestication, especially something that can pull a plow or wagon.
What do these two places have in common, a temperate to warm climate combines with lots of mountains on the eastern coast of a land mass, which means lots of rain and lots of mineral deposits.
temperate climates have the advantage of vastly lower pest and disease occurrence, the downside is a limited growing season. generally you want a climate that is mild and not too hot or too cold.