The upcoming IFA conference promises a lot of new mobile devices that will certainly feature cutting-edge technology as well as new designs. But some models introduced in the previous 12 months are still very attractive to many consumers, including the LG G3 and the Nexus 5.

Because both models have received positive reviews, it's not surprising that people want a comparison of the two – they're both made by LG, but the Nexus was co-developed with Google.

The LG G3, released last May, is powered by a Qualcomm Snapdragon 801 chip with a 2.5 GHz quad-core Krait 400 CPU and an Adreno 330 GPU. It has either a 16GB storage with 2GB RAM or 32GB storage and 3GB RAM. Its storage can be expanded up to 128GB.

The Nexus 5, released in Oct. 2013, on the other hand, runs on a Qualcomm Snapdragon 800 chip with a 2.26 GHz quad-core Krait 400 and an Adreno 330 GPU. It has a 16 or 32GB storage (not expandable since there's no microSD slot), and 2GB RAM.

Both run on Android KitKat, but with a few differences. LG G3 uses the OS but with some LG features integrated into it, while Nexus 5 maintains the unaltered KitKat version.

The LG G3 has a 5.5-inch display with a resolution of 1440 x 2560, giving it a 534ppi-pixel density. The Nexus 5, on the other hand, has a 5.0-inch display with a resolution of 1080 x 1920 with a pixel density of 445ppi.

The LG G3 comes equipped with 13MP camera that can support 4K video capture, and a 2.1MP front-facing camera that supports 1080p video recording. It has dual-LED flash, geo-tagging, face detection, along with other camera features. In comparison, the Nexus 5 has an 8MP camera with 1080p video recording support, along with other camera featurs, and a 1.3MP front-facing camera.

For typical usage, as tested by Android Geeks, the LG G3's Li-Ion 3000 mAh battery can last 48 hours on regular use, while Nexus 5's Li-Po 2300 mAh battery lasts for 24 hours.

Since the Nexus 5 is older than the LG G3 by roughly seven months, then it's not surprising that the latter performs much better. There are rumors of a successor to Google's phone, though – Nexus 6, Nexus X, or Motorola Shamu as it's being called now by tech fans – and this could have even more impressive features than its predecessor. While it's speculated that it will be released in the fourth quarter of the year, there is no confirmation from Google just yet.