Just remember that Toyota did not make their glass. They bought it just like you only in bigger quantities. So "OEM" is really aftermarket but built to OEM Specs.
Here is some information to help you decide:
OEM Distributor Auto Glass
OEM glass is made to the same specifications as dealer glass, but not necessarily by the same distributor. For example, OEM Ford windows are the same color, durability, thickness, size, and shape as the original windshield specs from Ford. Windows labeled "OEM" are virtually identical to dealer glass except they aren't always made by the same company that originally contracted with your vehicle manufacturer.
Why? Automobile companies change auto glass contracts from year to year, so the company that made your 1972 Chevrolet window glass may not be the same company that manufactured your 2008 Chevrolet window glass. A good example of this is on or around May of 2009 PPG Industries Inc.'s spin-off Pittsburgh Glass Works LLC has entered into a partnership with Daimler AG to supply automotive glass to the German vehicle manufacturer. Under the new, multi-year contract, Pittsburgh Glass Works will be the primary windshield, door and rear windows' supplier for Mercedes-Benz cars and sport utility vehicles.
Let's say you need a new Honda windshield for your Civic. Your Honda windshield may have originally been produced by APTech "a US subsidiary of Asahi Glass of Japan", so that's the brand you'd get if you went to the dealer. If you went to a local auto glass shop here in the good old USA you'd get your Honda window from a reputable OEM distributor like Pilkington or PPG/PGW who makes the exact same windshield, to the exact same specifications. Because your windshield wasn't originally made by APTech, it doesn't qualify as dealer auto glass, but it's just as good.
All OEM distributors contract with one or more of the various car manufacturers, and that's what qualifies them as Original Equipment Manufacturers. OEM is a good choice for your Honda Civic unless you absolutely have to have the Honda logo on your windshield.
Aftermarket Auto Glass
Aftermarket auto glass is made by companies that do not contract with any car manufacturers.
What Are The Markings On Automotive Glass?
The "E" mark simply means that the glass is ISO 9002 and EEC approved for sale in Europe. Chryslers and Fords made for export have these when sold (Neons, Cougars, etc). Sekurit (the trademark of France's Saint Gobain Group) is the primary supplier to Ferrari. SIV (Societe Italiana di Vitres- Italian Glass Company-part of the UK's Pilkington Group) is another supplier. Sekurit, Sigla (German subsidiary of LOF/Pilkington), and USA's PPG/PGW (the same PPG from CART Indy Cars) are suppliers to Audi, Porsche, Mercedes-Benz and BMW in Germany. APTech (US subsidiary of Asahi Glass of Japan) supplies the M-class SUV made in the USA. Ford (aka "Visteon"/Carlite) and Daimler Chrysler are the only two automakers that fabricate their own autoglass in the world. The manufacturer of the glass (regardless of the trademark) is listed in the logo. The number that follows "DOT-" is the code that tells who made it.
This is good information for anyone especially the last paragraph. Hope this helps.