Toughest schedule remaining according to Tankathon.com: NYK, MIL, ATL, BOS, MIA. ESPN's BPI playoff odds have MIL as 3rd seed by a 6 game margin over BOS in 4th, MIA 5th, ATL 6th, and NY 9th. The difference between BOS, MIA, and ATL is minimal, so any of them could end up 4th through 6th. It seems very unlikely that the NYK will be our match-up, but they would be my top choice to face.
After that, I'd rather play ATL. Young is one of the very worst defenders in the NBA by the numbers and to the eye. MIA next because you don't want to face all three of MIL, BKN, and PHI if you can avoid it. In other words, getting the 4th or 5th seed would be a lot better than the 6th seed. MIA has several players in the rotation who are not having the years they had last year, but they're far scarier than the Hawks, who have little playoff experience.
Overall, I fear BKN the most and MIL the least of the top 3, and I'm not sold on PHI despite our last outing. Embiid is clearly among the very few true MVP candidates, but playoffs are grueling, and he's shown a tendency to fade the longer they go. Also, Ben Simmons at the end of close games is a liability offensively.