Both my 5lb-er and my 19lb-er are pretty healthy.
Hamish (my teapot!!) is quieter and definitely been quite healthy (he is now almost 15) my little guy has been a doll, a bit noiser, but sweet as pie, so, I can't say I have a preference. When I am blue, my solid, heavy boy grounds me, but my lil guy licks and kisses up on my fact like a little butterfly flitting around, so, they each serve a wonderful purpose.
diversity, ain't it grand??
