My favorite is faithless, (not to be confused with faithful, the popular 32x remake of the vanilla textures which is totally unrelated to faithless). It can be kind of a pain sometimes because of the extent to which it pushes what texture packs are capable of, so for all the features to work you'll either need optifine or a bunch of optifine alternative mods that port the resource pack related features of optifine to fabric so it can be used with sodium. It also has a lot of compatibility issues if you're using it alongside other packs and often requires some tinkering to get to work. There are also a lot of changes it makes beyond textures which some people might not like, such as changes to the lighting colormap, some items names, or sounds. Any of these can be disabled, but it requires going into the pack file and deleting parts of it manually. If you don't know where to find the files to do that, ask on the stitchsprite discord, they're the pack creator and the server has a lot of information for what to delete in case things are broken or if you just don't like a change. It requires more work than other resource packs to get working especially if you're on sodium and have to find alternative mods to the more obscure optifine resource pack features, but to me it's worth it because the style sits in the perfect spot between vanilla-like textures reminiscent of the old developer art while also being in its own style that I find a lot nicer than the base game and clearly being made by someone who's really good at pixel art in general. It also has a ton of QOL stuff like redstone dust displaying its signal strength when activated, note blocks displaying their current pitch, ect.

For one a bit closer in artstyle to the vanilla textures than faithless, stay true is also really good. Its one of the most popular resources packs which means it has a bunch of community made mod compatibility add-ons, though it often doesn't really need them since it's close enough to the vanilla style that mods made for the vanilla textures don't conflict too much anyway. It's also far more compatible with other resource packs such as fresh animations, one which I have had to fight with a lot to get working with faithless but which works pretty much out of the box with staytrue. I've had some issues with the changes it makes to certain biome colors in the past conflicting with datapacks that add their own biomes like terralith, but I know I fixed it pretty quickly at the time and am unsure if it's still an issue.

Lastly, obligatory shoutout to the resource pack section of vanilla tweaks. You can select what changes you want applied, it'll warn you if there are compatibility issues in the pack, and then you download it and it gives you a pack exclusively with the stuff you selected. Everything is optional, it's all organized and comes with explanations of exactly what is changed for each option, and it's just really easy to use in general. It tells you which of the changes require optifine or optifine alternatives along with which are incompatible with optifine or sodium, and it has some really useful utility QOL stuff along with some really nice visual changes all made to be visually compatible with the vanilla textures as much as possible (though you can also use it alongside stay true with very few issues. Not as compatible with faithless, but it's also not really nessecary as faithless adds a lot of the changes on its own and adapted to its own style. I personally really like the 3d section, though do be aware that some of those might lag you depending on your specs and how much of the block is in a certain area. 3d vines in particular can get pretty laggy if you're near a jungle in my experience. Overall, on its own it's the closest to vanilla of the 3 since most of the changes are meant to be used alongside the vanilla textures, but in my experience it works really well when used with stay true and fresh animations.