IMO the strength of a ratchet is only one factor among many to consider. I personally don't like the ones with a big round head- even if they ARE stronger than the pear-head ratchets. 'Cause that big round head gets in the way- and I often need to access tight spaces with a 3/8" ratchet.
If I need a stronger ratchet for bigger bolts... I'll just grab my 1/2" ratchet.
As far as swivel ratchets go, my favorite of all time is she Snap-on
FLF80. I had one of these for several years, and it was my favorite ratchet for most things. Long enough for good leverage, flex handle for better access, strong, fine-toothed, fairly small head.
Problem is that these things are expen$ive. Depending on where you buy it, it could easily cost $120. Now some of you will think I'm making this up, but I got mine for $1. Many years ago I found a stripped out snap-on ratchet at a pawn shop and bought it for $1 because the gal didn't know what she had. Subsequent breaking and replacing got me an FLF80. And then karma caught up with me and somebody decided that they needed it more than I did.
Being a cheap [censored], I'm not about to pay $120 for a ratchet- I don't care how good it is. So I bought this one:
http://www.sears.com/shc/s/p_10153_12605...ku=00944815000P
It's an acceptable substitute most of the time. Not as stong, and not as fine-toothed... but otherwise does pretty much the same thing. And the head is a little smaller for slightly improved access.