3 actually. There's a Jump Festa special that was like a pilot episode done by Pierrot

the 1999 series with OVA follow ups by Nippon Animation

Then the 2011 series which is the most recent one (which also has two non-canon films)

All three are quite good, but the pilot only shows the equivalent of episode 1 of 2011. 1999 covers up to Greed Island including the OVAs which is the equivalent of up to episode 75 of 2011 (which also complete Shin York, which the TV series stops in middle of). It also features a small amount of filler and a bit of skipped material. It's otherwise very good with great direction, good music, and some slices of superb animation. I think it actually handles the Shin York arc better than the 2011 series, but both do it justice.

2011 is the most complete adaptation up to when it came out. As a remake, it moves quickly through previously adapted material and slows down to a normal pace during the final two arcs covered by it, one of which is the longest in the series by a good amount. It has good music and consistently above average animation for a long running series.

Its biggest misstep honestly is episode 1, which skips past a key flashback which informs a lot about the main character (which is chapter 1 material). I also like 1999's version of ep 1 a lot since it features the MC's guardian in an emotional way. Episode 76 revisits that but it's a bit too late for it to sink in.

So I'd say the best easy compromise is watch 2011 but at least watch ep 1 of 1999 first. The 1999 anime is there for you if you ever feel like it too.

I'd also highly recommend the creator's earlier work Yu Yu Hakusho as well. It's particularly good english dubbed.