However, from a general perspective, I think +10 is very attractive. Personally, as far as I remember, I have more losses when taking high handicaps on the underdog than high spreads on the favorites, so I'd choose -10.
Obviously, you'd have more losses on underdogs because that team is the underdog, that meant that they're not the favorite to win at that time, that's why bookies are putting in more money on them than that of the one team that's favored to win the match, that's how it works.
That wasn't an underdog that they'd need to win for the bet to win. We are talking about point spread here. If that underdog is +10 and the favorite wins by only 9 points, the bet would still win. Because of the point spread, decision making is quite hard. Even if one team is a heavy favorite and you believe they will win, the question now is can they cover the spread?
Is that not handicap that you meant? I do not like going for handicap. Some people like it especially to go for the weak team with minus that the strong team will still win them. I do not know much about basketball but I have gone for -2 in football before. But I do not like handicaps. I prefer to just go for the tram that would win but it can be a small odd for the strong team unlike handicap.
It's the handicap because you won't be getting odds like 1.90 when one team is a heavy favorite.
For the handicap to be +10 for the underdog, the favorite moneyline will likely be 1.20 to 1.25, so even if the favorite will easily win, would you be willing to risk your money for 25% profit of your bet?