To my eye, Arabic. Never learned to read or write it. I do like the Chinese also. I have learned some of it. The Calligraphy is very easy on the eye. (The printed is easier to read)
There are many alphabets in use around the globe. Apart from the Roman alphabet, there are Greek, Cyrillic, Arabic, Chinese, Japanese, Thai, and so on. Which, to your eye, is the most beautiful? Have you ever taken the trouble to learn to write it?
I like the way Georgian looks. It looks like a fantasy script:
I can write Greek (most of my family is Greek so I've learned to write and read the alphabet and I know some Greek words too), but that's about it.
I like Japanese, but that might be because I can understand a little of it. I can read and write Hiragana (main script) and Katakana (Hiragana, but used for foreign words). I don't know that much Kanji (the symbols, most of them come from Chinese).
日本語 は べんきょします。
The nordic alphabets, especially Danish, which I have used every day for the past forty-some years. They have more vowels than the English alphabet.