I'm thinkin that if your options are relatively close in performance and one has 64 bit and one does not, Yonah stays on the shelf and Turion goes home...
$.02

AMD to Release Dual-Core Turion 64 Chips Early Next Year.
AMD Dual-Core Turion 64 to Compete With Intel Yonah
[08/24/2005 12:39 PM]Advanced Micro Devices’ executives reportedly said that the company aims to release its low-power dual-core processor for mobile computers in early 2006, which is approximate release timeframe of Intel’s dual-core Intel Pentium M code-named Yonah chip. Besides that, AMD tipped that its mobile chips may find home in IBM ThinkPad notebooks.
AMD has been marketing its AMD Athlon 64 X2 processors for desktops for months now and said that the chips can be used in notebooks as well. However, the company did not reveal any information about commercial release of mobile processors featuring two processing engines. Now, according to InformationWeek web-site, AMD plans to launch its dual-core AMD Turion 64 central processing units in volume early next year, probably in order to stay competitive with Intel Corp., which launches its new Intel Centrino mobile platform powered by dual-core Intel Yonah processor in early 2006 too.
AMD Turion 64 mobile processors share AMD64 architecture with the desktop and server Athlon 64 and Opteron chips, integrate memory controller and feature other advantages of AMD’s latest innovations. However, AMD Turion 64 processors come with thermal design power of 25W – 35W, much lower compared to typical AMD Athlon 64 and AMD Opteron central processing units.
In addition to earlier-than-expected launch of AMD Turion 64 processors with two cores AMD also expects Lenovo to adopt its mobile chips for its ThinkPad series of laptops for the very first time.
“We had actually been talking to both Lenovo and IBM before Lenovo bought IBM’s PC and ThinkPad business earlier this year. And we were further along in those conversations, actually, with Lenovo,” Bahr Mahoney, division marketing manager for AMD’s mobile business is reported to have said.
In addition to shipping its dual-core, low-power mobile chip, AMD plans to roll out its
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