iPhone 3GS vs iPhone 4

So my Uncle has the iPhone 3GS and my cousin has the iPhone 4. I have used them both and have found out that there is signal strength problems with the iPhone 4. So here I have wrote down some sins and cons:

Good things about the iPhone 3GS:

• The first iPhone to record video
• It had metallic writing on the back
• It was twice as fast as the iPhone 3G

Bad things about the iPhone 3GS:

• It had the same camera than the iPhone 3G
• The design was not altered at all
• There was no updated battery so the battery went out in a tick

So those are the things about the iPhone 3GS and now here are the sins and cons about the iPhone 4:

Good things about the iPhone 4:

• Facetime was introduced to the iPhone 4
• It could record 720p HD video
• There was a flash and a front facing camera

Bad things about the iPhone 4:

• The signal strength kept going down when I held it in my hand
• The front facing camera only records in 360p
• The battery goes in a tick when you use multitasking

So there are the sins and cons about the iPhone 4 and the iPhone 3GS; And to be honest if I had a choice I would definitely go with the iPhone 4 but then I would have to face the bad issues like the signal strength and the battery.