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Vertical dropout's. Most common type of dropout found on new derailleur equipped bikes.
Advantage is that rear wheel replacement with quick release is slightly easier. Disadvantage is
no horizontal adjustment of chainstay length available to allow for chain/sprocket wear or rounding chain length up or down to the nearest whole link value.
If you want to use a fixed wheel or hub gears with this frame you will need a chain tensioner.
Apparently there are some bottom brackets being made that will allow some chainstay length adjustment. But I'm not going to recommend products that I have never seen.
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Horizontal dropouts seem to be considered old fashioned these days. But they are suitable for derailleur with quick release and you can get away with a fixed wheel too because dropout allows the chainstay length to be adjusted by repositioning the wheel. My bike has dropouts similar to this and I can tell you that getting the back wheel in and out is still very easy ;-)
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Track dropouts offer most horizontal adjustment and are very suitable of fixed wheel bikes with flipflop hubs.
Note that this frame does not have a mounting for a derailleur rear mech.
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