Which one is, in general, a better choice between the two? I know there's certain advantages to both, but I was just wondering which one everyone else would pick.
I personally think +attack helps in more situations, including no pills battles and same pills.
Lord Hive OLB said it all.
One advice though, if you want power manipulation go with -power. It's better for you. Considering only bonus and not single cards, All Stars are better than Ulu Watu or bangers, because removing 2 power from your opponent is better than gaining 2 power yourself.
The opposite happens with attack manipulation, you should go with +attack because it has no maximum while -attack always has a minimum. As an example most montana cards have to play one pills to reach their 8 attack minimum or their bonus is no good.
I personally like both in a deck or - power/atk. In general atk is easier though, as it means even when you don't pill a card can get through whereas power clan need to pill against atk clans or take a hit. Power clans though can be as good with a good understanding of the game and planning ahead (what to sacrifice, what to play and what to bluff) but atk is easier and can save pillz. bangers though are quite good as they have cards like blaaster who has both + and - power, bodenpower who has - atk and + power or shann who has + power + pillz. So I don't think there is so much a best but rather an easier option...
It's just the situation and preference. In the deck the computer gave me only cards that matched were lino borsa and gary and it came with jeff... Now in the beginning I found the +power worked more then the -att because as a starter it was easier to understand the + power advantage jeff had lol.. Now I'm just a sucker for Jackie and Vicki duo or Lamar and Marina... but I would always favor -/+ att at this time..