Of course I am biased. I support one football team to the exclusion of all others. That's the way it works. It's a game. It's fun.
I love football, never could get enough of it since being taken to Leeds as 5 year old. As soon as I was old enough to get the bus I started going to Bradford City as well, then Huddersfield Town, Halifax Town, Guiseley, Farsley Celtic, the two Harrogate clubs and my local one, Thackley AFC. By the 1980's I had a car and what was normal then, was for friends or football club team mates to get together, choose game and just go, no worries about tickets or sitting together. Simple times. By the late 1980's I was working in Spain and found that it was entirely normal to support more than one team. Clubs there have friend and enemy clubs all over the country with the most unlikely alliances having been formed between fans/clubs.
If pushed I'd plump for Bradford City, but even when I have an ST I don't see many games because every season I will make the effort to see all the above clubs plus Celtic, Stenhousemuir, Sporting Gijon, Real Betis (Seville), Hercules (Alicante) & Malaga. I'd go to Leeds too but haven't been able to get a ticket for while.
Sitting next to a fan who can only "see" his own team does my head in.