Let's face it, while most of us on the Wizard of Las Vegas forum only plays games with very low house advantages or even games with positive expectation for the player, the vast majority of gamblers who go to Las Vegas play the slots.
My aunt is a perfect example of a very valuable slot player. She is perfectly happy playing the maximum 400 credits on the penny slot machines, or the maximum on the dollar slots, or even the $5 or $10 slot machines. She will sit in front of a slot machine minding her own business for 8+ hours a day, and normally brings a bankroll of between $15,000 to $20,000 for a 4 day long trip to Las Vegas. If she wins money, fantastic. If she loses but has fun with her friends, that's perfectly fine too. As a wealthy widow with grown children, the only thing that she worries about other then gambling are her grandkids, whom she spoils rotten. She mostly gambles at a local casino in California, but makes about 3 or 4 trips to Las Vegas a year with a group of her friends, who are also all wealthy widows.
The last 4 or 5 years, my aunt and her friends have been staying and playing downtown (Golden Nugget, I think) and let me tell you that she and her friends have been treated royally by their hosts. I am a fairly big table games player, but the red carpet really gets rolled out for them when they come to town. However, on her past trip this February, she commented that downtown is getting too dirty and old for her tastes. I guess one of her friends got hassled by a drunk or something while they were walking around, and they are thinking about trying out a different casino on the strip or even off the strip (provided that there is enough to do).
My question for the forum is this. Which is the best slot club for slot players in Las Vegas? How does the MGM M-Life and Ceasar's Players Club compare to one another? The reason why these two pop into my mind is that they occationally wander from casino to casino.
Are there any other safe, nice, clean, casino locations you would suggest for a group of women in their early to mid 70s who love the slot machines?
Please note that it's slot machines that they like playing and not video poker. Over the years I have kept trying to get her to change over, but she says that video poker hurts her head.

Not answering your question, but noting that 'a group of women in their early to mid 70s' who 'occasionally wander from casino to casino' will have a bit of a shock switching from downtown to the strip where the casino next door is a 30 minute hike.

That's very true. I once took my aunt with me to Green Valley Ranch a couple of years ago and she loved it. However, when she mentioned it to me when I spoke to her last, I informed her that it really wouldn't work for her friends as it is too far away from everything else.
You are right that they will probably not like walking from casino to casino on the strip, but they are comfortable taking cabs or town cars around Las Vegas.

The M Life slot club is the best for strip properties. Caesars is the worst.

The Tuscanny was just voted Best of Las Vegas for slot club in the annual RJ poll.

'So as the clock ticked and the day passed, opportunity met preparation, and luck happened.' - Maurice Clarett

I agree that Caesar's is far better than MGM. I have both and I get something from Caesar's and nothing from MGM.

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'Dice, verily, are armed with goads and driving-hooks, deceiving and tormenting, causing grievous woe.' -Rig Veda 10.34.4

Simplicity is the ultimate sophistication - Leonardo da Vinci