While comparing the mobile phones, we will see which one is the best and in what extent one is better than another. Let's see how far we can go when analyzing the features. As per my knowledge and observation both phones are on par with each other. It is really hard to praise the single one but we can try to make out the minor as well major differences between these phones which distinguish these from each other.
Both the phones are having the same 2.4 inches QVGA screen that supports 16 million colors and 320 x 240 pixels resolution. But there is a bit difference between the dimensions like, E55 measuring 116.5 x 49 x 9.9 mm and weighs just 96 grams while the E75 is little bit bulky with the casing of 111.8 x 50 x 14.4 mm with full QWERTY slide out keyboard and weighing 139 grams.
In terms of taking snap experience, I have realized that both of the phones are having 3.2-MP camera that integrates so many same good features but there are some difference between the features such as the E75 is having 8 x Digital zoom while E55 has 4 x Digital zoom and EDOF camera.
E55 and E75, both of these widgets are blessed with good music features like Music player, MP3, video Ringtones, 3.5mm Nokia AV Connector, audio recorder, voice recorder, voice commands and FM radio with RDS. Only the difference is that the E55 has audio streaming, Shuffle, Repeat, Equalizer, music search etc while E75 contains Internet Radio, Nokia Music Manager and Nokia Podcasting Support.
Along with several essential features these are having the same connectivity features like; 3G HSDPA, cabled USB connection, wireless Bluetooth® connection, WLAN Wi-Fi, HSCSD, GPRS and EDGE technology.
As you can gain up to 280 h (2G) / 264 h (3G) of standby time, talk time Up to 5 h 20 min (2G) / 4h 12 min (3G) and music playback up to 25 hrs with a single charge via E75, whereas the E55 adds up approximately 672 h (2G) / 432 h (3G), talk time up to 8 h (2G) / 6 h (3G) and music playback up to 18 hrs.
Furthermore, the phones embed the same Internet feature like Nokia Browser with mini Maps with HTML, XHTML, MP, WML & CSS technology and Nokia Mobile search.
No matter which phone you will choose as they are related to the same family and contains many similar features such as email, GPS support, speakerphone, phonebook, Symbian 9.3 Operating System and so on.