Xing Yi and Wing Chun

Oh yeah, Hsing I is battle tested.

Actually, it’s moves are pretty simple. Regardless of the lineage, the 5 elements basically amount to:

guard position
punch
uppercuts (block)
parry, then strike
push-pull.

These features work in real combat because of their simplicity.

Also, the Hsing I fighter can rotate to face multiple opponents if need be. The same can be true of any true kung fu stylist.

Taijiquan also fights well when applied properly, especially when one doesn’t try to overcomplicate the combat applications.

xing i is a good start for you, although most good xing i practicioners also learn bagua, because one is no better than the other. my shifu is li tailiang, and he is very adept at all three internal arts. he will use his xing yi fist or power, combined with the superior bagua footwork, so all in all, if your chun is good, you might want something different like bagua, it will teach more circles, which are lacking from most wc, and it will help you beat a wc guy of your same skill level.
bagua circle walking is a superior form of footwork, so again, its up to you.you cant go wrong either way. i think what will really answer your question, is— which art has a good master teaching it in your area.