Watches plus cellular or gps only - another question

I know in prior years this has been discussed, but bear with me as I am looking for current thoughts. I am debating whether to upgrade to plus cellular. I travel and think if I get my purse stolen or my phone breaks I still would have the watch, but I am not on an unlimited plan (and usually it is no problem) but if I go with the plus cellular watch does it use more data? Or, is the data side of the watch still wifi? Do you think it is worth it? I have had the gps version for years and never had any issues and am not quite sure why I, now, am wondering about it. Help me make up my mind. :-)