Nancy,
Anything Google offers - Voice Search, Gmail, Hangouts, Maps, Google Now, Google Play Music, Play Store, Play Books, Play Newstand, YouTube, Unified Calendar, Google +, Google + Photos, etc. can all be accessed by every Android device either phone or tablet. The exception is with Amazon's tablets which don't have access to the Play Store but Amazon's app market. So, if screen real estate is what you are looking for, the Nexus 10 is a great device. It is older and therefore not as fast as the G Pad or Nexus 7 2013 or any of the Samsung Tablets (Note 10.1 2014
http://www.samsung.com/global/microsite/2014galaxynote10.1/ for example). If you are looking at a 10", the Note 10.1 2014 is excellent and I would recommend over last years Nexus 10.
As for the G Pad, it's tough reading professional Android reviewers because they usually steer toward stock (vanilla) android as their preference. (Nexus line to be exact) So a GPE will appear more "sexy" to them vs. having a "skin." The G Pad specs between the orig. & the GPE are identical. So, it's up to the features LG has put in vs. having the newest Android software and no LG features that you need to weigh. QPair is excellent but since you don't have a cell, it is not necessary. QSlide & Slide Aside are great but the GPE has a button for multi-tasking as does the orig by just holding down the home button. So, either way, you will have multi-tasking. Smartshare is another excellent add-on but you would need a compatible tv or such. If you buy a Google Chromecast ($35) retail, most (relevant) apps have a Chromecast feature built in if you need/want to share with your tv. The GPE has an IR Blaster but there are no compatible apps at the current time whereas the orig G Pad has QRemote. I have that feature in the G2 and it's awesome but since I already have it, I didn't need it for my tablet. Great feature though.The camera, themes, ClipTray and Knock-On are about the only other differences that I could think of that differentiate the two. The camera on the G Pad GPE is pitiful. There's no flash and the software is very weak. If you are looking for a reasonable camera, you need the orig. G Pad's software or look elsewhere such as the Note 10.1. The G Pad is a tablet though and shouldn't be thought of as a camera. I absolutely love Knock-On so I can honestly say I REALLY wish they had kept this feature on the GPE. It is revolutionary. Google Translate (an app) would solve your need for Translation so no loss there and while the ClipTray (being able to keep your copy & paste history in one spot) is cool, it's not necessary.
I'll say this. The G Pad is a great device hardware wise. For your first tablet, I would recommend going the orig. G Pad route as it will be updated, you won't see any software bugs, it has great features, and seems to be the size tablet you are looking for. They have these at any Best Buy to touch & play with. The GPE tablet is for tinkerers, lovers of stock android and fanatics who get excited for the next version of Android and want it immediately. Both are excellent tablets but cater to different markets. Hope this helps...