I have 4 sows and my friend has 3 boars, while my other friend has 1 boar (in the process of finding a buddy). I cannot tell a smell difference.
My one sow, Pumpkin, is the biggest lover EVER! She loves snuggles and kissing you is her favorite thing to do. She also loves chin and behind the ear scratches. My other girl Nala is ok with lap time, as long as there is food or constant snuggling, no petting though. Butternut just sits there frozen on your lap, but she likes pets, the stroking kind. Sarabi is totally anti-attention. She likes to be wrapped up into a piggy burrito and then snuggled. No pets or kisses for her. She likes to burrow and sleep in the blanket(like a hedgehog). You cAn see how their behaviors differ. Their weights are also different, so don't judge if you want boars or sows by size.
Sarabi: 1,090 grams
Nala: 1000 grams
Pumpkin-880grams
Butternut- 810 grams.
All my friends boars are all generally snuggle muffins. My one friends boar is around 3,000 grams(!!!!) and one of her other boars is 1500 grams. Boars do typically tend to be bigger, but that's just in my experience.
I only chose sows because my rescue was at a 3:1 sow:boar ratio. I got Nala and Pumpkin from there, while Sarabi&Butternut were from [MENTION=20166]nibbler100[/MENTION]. If I could, I would definitely get a pair of boars, but I cannot afford any more, and I don't have the time nor space for more! You really just have to click* with the pigs. It could take a while, it took me 6 months to get Sarabi and 3-4 months for Butternut.
Also, PLEASE go to a rescue. Don't buy from petstores or breeders. When rescuing you get to save a life and watch them bloom and flourish under your extreme piggy attention giving! Petstores are just mass breeders that typically don't know much, small/local or huge/chain stores. Breeders are also really bad because giving birth can be fatal in some cases and it's really stressful on momma pig.
Best of luck on your search for a piggy and make sure to post pictures of them! Sorry if I hijacked or rambled in your thread, I was trying to cover as much as possible because I asked a very similar question when I first joined.
* By click, I meant that you feel a connection with the pigs. When I got my first two, they immediately snuggled into me and I got a light and fuzzy feeling in my tummy. When I get really excited, I don't breathe... It's this wierd thing where I hold my breath, but it has a lot of pressure and I cannot exhale and inhaling is really hard. It only lasts for a few seconds but I was so excited, that happened to me for 30 seconds!!! I knew I had to get Nala and Pumpkin. When I saw Sarabi's story, I just had this super strong pull. It felt like my heart pumped really slowly and everything was "slow mo". Getting Butternut was just a lot of dancing and raw excitement. Each click will be different, but you WILL know when you click... Trust me.