[TR] Group 49 battery preferred?

[dorpaul]

I'm thinking I havn't really annoyed folks with my questions, but I'll try to
improve...

Now about choosing a battery.  I've been shopping for one that will more
completely fill my 14" battery box.  Although this listserve's members tended
to prefer a Group 27 size battery, I found some longer (possibly newer sizes).
Only then did I learn that their weight might be a problem.
    Well, I took my bathroom scales into several laps, today.  While I didn't
have a pen on me, this what I learned:
Grp. 24              40 lbs.  (this seemed too short)
Grp. 27             48 lbs.    135 Residual Capacity,  Durolast brand , about
12" (I think)
Grp. 49              45 lbs.     (It was about an inch longer, I think)
Grp. 31              60 lbs.   (ruled out because it's proably too heavy),
Farm, 180 RC

So let me ask:
Why is Group. 24 or 27 ( recommended "highly" by this list), when a Group 49
battery fits the battery box better?  And has similar   CCA and RC?

Thanks, Paul  60 TR3A