This changes with my mood, but I definitely have some standbys I always seem to enjoy:
Stock:
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Clicky: Box Whites - pretty light with a mild but super-crisp and affirmative tactility. One of my fastest-typing switches, but obviously loud AF.
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Tactile: Kiwis - on the stronger side of tactility, but very well-balanced and smooth making it a very easy switch to use. Kiwis aren’t always available; T1s and their siblings are very similar, using the same stem but different housings.
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Silent Tactile: Silent Box Browns - Probably my favorite overall daily-driver; a good balance of work-friendly and snappy operation. I probably wouldn’t put them on a high-end custom, though - they aren’t super consistent under close scrutiny, in any aspect.
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Linear: Tough for me to decide between Ink Blacks and Ink Yellows; both exceptionally smooth, with the latter having a shorter travel. Pricy, though. Two other linears great out of the box are Tangerines and Silks, each having pretty good factory lube. Learning and doing it yourself can give you better results, but these are great ways to try very smooth switches before doing that.
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Silent Linear: Silent Inks all day for me. There are plenty of really good ones now, but I’m partial to the sound and feel of these guys; a good balance between quiet and crisp.
Frankenswitches:
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Tactile: Heisenbergs - Halo stem in an Ink Blue. Crazy snappy, very smooth, bump takes up the whole of its short travel; probably my favorite switch overall at the moment.
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Silent Tactile: Lemon Lushes - Gazzew U4 stem in an Ink Yellow w/ a donut-dipped 68g ThicThock MP spring; that last bit is critical to the recipe. Bump is a little on the wide side for me generally, but so far I’ve really not tried anything else like it - the interesting mix being a pretty strong bump with a very soft, bouncy bottom-out. Prohibitively expensive to fill a whole board with, but I do plan on using these for a numpad at work.
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Linear: Creamy Inks - Cream stem in an Ink Black. Smooth, shorter travel, and has a sound I prefer to either Inks or Creams.
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Silent Linear: Pretty much anything with a Gazzew linear stem in it. (Made by Outemu; you might find them under their own name depending on the market.) I still prefer Ink Blacks overall, but they aren’t half as quiet.
While I generally prefer my small number of favorite frankenswitches to stock, I’ve yet to try a clicky one that’s worth putting together. I’ve heard of good ones, but apparently the bits are hard to come by. If you’re interested in reading more about modded switches, here is a thread with lots of discussion on tactiles specifically, and here is one with a handful of various recipes.