SNA vs UXA on older Gen 4 GM45 GMA45 Intel graphics

Which acceleration method should I use? Are there any grub or xorg parameters that I should be using?

$ grep -i -C 3 sna /var/log/Xorg.0.log
[     4.756] (==) intel(0): Depth 24, (--) framebuffer bpp 32
[     4.756] (==) intel(0): RGB weight 888
[     4.756] (==) intel(0): Default visual is TrueColor
[     4.756] (**) intel(0): Option "AccelMethod" "sna"
[     4.756] (--) intel(0): Integrated Graphics Chipset: Intel(R) GM45
[     4.756] (--) intel(0): CPU: x86-64, sse2, sse3, ssse3, sse4.1
[     4.756] (**) intel(0): Framebuffer tiled
--
[     4.757] (II) LoadModule: "dri2"
[     4.757] (II) Module "dri2" already built-in
[     4.757] (==) Depth 24 pixmap format is 32 bpp
[     4.757] (II) intel(0): SNA initialized with Eaglelake (gen4.5) backend
[     4.757] (==) intel(0): Backing store disabled
[     4.757] (==) intel(0): Silken mouse enabled
[     4.757] (II) intel(0): HW Cursor enabled

$ grep -i -C 3 uxa /var/log/Xorg.0.log
[     6.246] (II) intel(0): [DRI2] Setup complete
[     6.246] (II) intel(0): [DRI2]   DRI driver: i965
[     6.246] (II) intel(0): Allocated new frame buffer 1728x1050 stride 7168, tiled
[     6.260] (II) UXA(0): Driver registered support for the following operations:
[     6.260] (II)         solid
[     6.260] (II)         copy
[     6.260] (II)         composite (RENDER acceleration)

I'm forced to use the gnome workaround for tearing, if it matters

CLUTTER_PAINT=disable-clipped-redraws:disable-culling

https://bugs.freedesktop.org/show_bug.cgi?id=37686#c123
https://wiki.archlinux.org/index.php/Gnome_3#Tear-free_video_with_Intel_...