I prefer WiFi over LTE with my Droid Razr, the battery lasts a lot longer on WiFi, go figure. OTOH, I get 15Mbps standing in my kitchen at 5PM (edit: on LTE), it's pretty nice when you need it. My LTE is faster than my cable modem.
If I really need my battery to last a long time on cell signal only I use the Phone Info app to switch to 3G only.