Best Option for Internet Access Traveling Cross Country?

Thanks again everyone for the feedback! Sounds like Verizon MiFi is the dominant choice, though I'm also glad to hear Straight Talk is offering hotspots and I'd be interested if anyone has experience using both Verizon and Straight Talk?

My understanding is that Straight Talk is operating on the same cell networks used by Verizon, AT&T, etc. - so I would think coverage should be similar? I'm also wondering about speed?