What app is better, Viber or TextMe for international texting?

I will be going to spain and france this week. I need something I can text people with using Wi-Fi. What app is better, Viber or TextMe? Id also like to call people and send photos. I read somewhere you may have to pay money to text/call abroad. Also, people with iPhones, can I text my mom who also has an iPhone for free over Wi-Fi without it being charged? I hear you can do that too.

My parents use Viber frequently, so I recommend that. Works fine and is free.

Viber is good for texting and sending other files too.

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