K&F Concept-301 16MP 1080P HD Trail Camera 0.4s Trigger Outdoor Waterproof Hunting Infrared Night Vision Mini Camera, 2PCS

SKU: KF35.006V2

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I have no idea if Xtellar trail camera is better, but I do know that with a good SD card-this trail cam works just fine- I don't have any problems with it. 
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IP66 waterproof, operation temperature: -4~140F, idea for outdoor application - deer, critter and any animal wildlife trail, hunting, or home security. 
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Never have seen that happen on my SD cards maybe try a different brand of card 
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I'm sorry I can't help. Mine has never put a pfd file on the sd card. Perhaps its your computer or the device you are using to read the card??? 
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Not sure what you mean. You can enter a code that you must put in in order to operate the camera. 
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It will capture pics of anything this is in range and moving. I believe it takes video or pics but not at same time. 
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Per the GardePro Model A3 Instruction Manual: "SD, SDHC, or SDXC Regular memory card, max capacity 128 GB 
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No! I operate mine just fine without one 
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If you mean how long does it last? Depends on where you put it and if it's triggered all the time. In a high trafficked area, the battery will maybe a week. The same concept is for the outdoors. It also depends if you use lithium or alkaline batteries. Lithium will last longer. I set my camera next to a goose nest and she constantly set it off. Lithium batteries lasted 2 weeks 
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I use a 64GB San Disk Ultra Class 10 SDXC card . It works. No issues have been noted. In my research faster transfer rates are best so I made sure I used a Class 10.