One word:
silicone. Stick to toys made out of premium silicone. Avoid PVC, latex, TPR, TPE, sil-a-gel, and especially "jelly".
Ugh, discussions about sex toys always seem to include recommendations for toys that aren't made from body-safe materials. Before you spend any money on a toy, read up on body-safe toys. Here's a starter:
http://dangerouslilly.com/toxictoys/
Cheaper materials often leak phthalates and other chemicals. These can lead to health effects like hormone disruption or a noticeable stinging sensation. Chemical leaking also leads to a toy degrading/melting over time, starting with discoloration of anything stored touching the toy and the toy itself.
Silicone is nonporous. Pores in materials trap germs.
Silicone can be sanitized by placing it in boiling water or using a mild bleach solution. Don't try either method with cheaper materials.
Note that silicone can vary from firm to squishy. Reviews from sex toy bloggers usually will tell you what you need to know about a toy. Also, don't use silicone-based lubes with silicone toys.
Recommendations
Silicone doesn't have to be expensive. Edenfantasys' Caesar often goes on sale for $40.
https://www.edenfantasys.com/dildos/realistic-dildos/caesar
Vixen Creations' Vixskin products are popular because they're semirealistic and have soft silicone. They come in many sizes from 1.5" to 2.25" in diameter. Tantus' O2 and "supersoft" products are similar. Both companies' toys are available in many online stores as well as directly from the manufacturers.
If you're shopping for a size queen, check out products from Square Peg Toys and Mr. Hankey's Toys. The Cutler X dildo from the latter is realistic and varies from 2.5" to 2.7" diameter. And they make even larger toys.
https://www.squarepegtoys.com/shop/category/realistic/
https://www.mrhankeystoys.com/blank-rwrlr/CUTLERX
One more option for larger toys is
https://bad-dragon.com/products/archer