I hate when my choices don't matter beyond picking a route. Why even add them then? Just make buttons with the love interests' names and don't waste my time.
What I like most are games that determine the heroine's personality based on the dialogue options chosen. Without locking out love...
The ability to skip already-read text. Surprisingly, not all games have this feature. If it's a mobile game — increase the text size, because reading tiny font can be uncomfortable. Sometimes — disable extra animation (some games really overdo it with various falling leaves, rain, and all that...
on all platforms. Most comfortable to play on PC, but on the go — Switch or phone. The Switch is very convenient, but game prices usually bite (are pretty steep).