resistive touchscreens lose precision with a screen protector applied, also the screens looks worse for the extra layer, not mentioning that the protector tend to catch scratches by itself, after a time you end up not seeing anything.
if you are cautious when using you ds scratches arent a problem, thing is my dsi is second hand and buy it with the scratch anyway and that is the only noticiable scratch is has, dsi touchscreens appear to be more durable that ds lite ones.
Using a touchscreen without a screen protector is irresponsible, especially on the DS. There are certain games which literally require you to swipe the hell out of it, and at the end of the day, the stylus is somewhat sharp.
If a screen protector is applied evenly and is of good quality, loss of accuracy is minimal if at all noticable. Besides, you re-calibrate your touchscreen once the protector is applied anyways, so the touch detection will adjust.
A good screen should also be transparent enough so the
"looks" of the screen remain pretty much the same - here I recommend
"Hori" screen protectors - they're regarded the best.
No protective screen scratches
"by itself" - it scratches because something else rubs againts it.
Some devices with resistive touchscreens actually used to come
with screen protectors in the box, for example my old smartphone did
(Mio A701) - in fact, the box contained two. Using them is very much advisable.
The DS Lite is extra bulky, feels cheaper.
Depends on many factors. My DS Lite felt a bit cheapo from the start, however my girlfriend's was perfectly fine - even the plastic felt different and the assembly was much better, which leads me to believe that my DS Lite, like many other late ones was in fact a
"factory refurbed" system, and those were sold as new.
The DSi is slimmer, easier to turn on/off, turn up/down the volume.
Digital volume switches instead of an analog slider, yay! Because less choice is always better! I have to agree as far as the power button is concerned though.
The DSi is the peak evolution of the standard DS family.
The DSi is not a part of the DS standard family - it's merely backwards-compatible. There are numerous differences OS
(Division into DS-Mode and DSi-Mode, completely different firmware with added functionality) and hardware-wise
(Different CPU clocks, different amount of RAM memory, different WiFi chip, no SLOT-2, SD Slot, Cameras etc.) between a DS and a DSi, too many to consider it a part of the same family of hardware.
Only exceeded by the DSi XL, which is great for football players, people with horrible vision and giants.
If only it didn't look hideous.