That doesn't mean I don't like Yu Yu Hakusho, because I have all 19 volumes but, Togashi's writing in that series really prompted me to get into Hunter x Hunter.
The back stories of the characters, the character development and also the subplots are so well delivered and they often overlap in very unique ways. This kind of writing is very hard for me to like, and the author presents it without it being confusing for me. (The overlapping plots in CLAMP's Tsubasa Chronicles for example hurt my brain, so I stopped reading the series).
The artwork is not as advanced as Yu Yu Hakusho, but there are points where the work becomes very detailed and shows just how talented a drawer that the author is. There is much more dialogue, as well. This book is quite a bit bloodier, and the characters run into a lot of life or death situations.
If you've read Yu Yu Hakusho you may notice similarities between the four lead characters and the Hunter x Hunter characters. Gon takes after Yusuke but very minimally, he is much more light hearted and gentle. Killua takes after Hiei as far as the gore is concerned... Leorio is a definitive Kuwabara, and Kurapika is the blonde version of Kurama. Still, these characters do have their own straights that separate them from other stories and make them very likable.
I recommend this to anyone who wants to read a story, a very, very big story! You'll really love it.
Edit: I feel it necessary to elaborate on the character's personalities a little bit more.
Gon - He is neither good or evil, very neutral most of the time but he has a heart of gold and a love for all living things, even the bad guys. He tends to be very curious, and loves to learn about new tools, techniques and take on crazy challenges. The one thing that makes him identical to a character like Yusuke is, Gon is heroic, can take a beating and usually gets incredibly angry at anyone who kills others.
Leorio - He's not the sharpest tool in the shed sometimes... He tends to act on impulse and lose his cool. Still, Leorio is a sweet character, with very strong ambitions and is also very loyal. Surprisingly though, he starts to take on a very strategic and calculating personality as the series moves on.
Kurapika - I didn't particularly care for Kurama's character, he bored me when I first got into Yu Yu Hakusho. Kurapika has that calm, super-intelligent style, but he is much more interesting and his rage sets him far apart from Kurama. He has serious motives, and while he is respectful to the other lead characters, he doesn't seem to me like a loyal character to anyone but the people from his past.
Killua - Of the four, I adore this character the most. He's rebellious, aggressive, somewhat hot-headed but he has a very child-like demeanor. He's bright, he watches everything and out of everyone is really is the most skilled when it comes to tracking things down or playing life like it's a poker game. He's a little on the dangerous side, being from a family of assassins but, he forms a very close bond to Gon very early on and becomes extremely loyal.
I noticed a lot of reviews mentioning the artwork... Togashi started this not to long after Yu Yu Hakusho, and he had some health issues during the final stages of the series that made it hard for him to illustrate sometimes. I think the inconsistencies may be due to that, and they disappear rather quickly as the series progresses.