Looking at the language-personally-I think double letters stand out since not all languages have those.
Curvy letters like a, n, u, r, s, c, e, o, d, b, p, g, q, h, tend to blend together- especially when handwritten.
Straight letters like x, z, v, y, w, arent any better...
And neither are l, t, f, i, j, lol
Now uppercase- Q, O, U, C, S, Then- D, B, P, R, F, E, Also- A, V, W, X, Y, Z, K And still- T, I, L, J,
So Id say nothing really 'stands out'.
Vowels tend to blend together, i's l's and t's are lost in the crowd and g's j's q's and p's are tricky. Id say K tends to pop out more than others, so does a rare X and when words end in Y.
Honestly its not the individual letters that stand out- its the patterns.
Double ee and oo stick out-plus other doubles, so do sounds like "ing" and "n't" "ck" stuff like that that is typically together and pops up over and over so you can catch on easily.
English has so many rules and exceptions to rules thats its tricky to learn to write. If you learn based off sound first, then you'll never write correctly.
In terms of sound, well I cant tell ya Ive grown up listening to it. However, I do find it fascinating how many ways there are to pronounce a word based on where you grew up.
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