How can I save money with hotels in europe ?

Best loyalty programs in europe?

I travel 30 to 40 days per year and stay in hotels.

I was wondering if there are any loyalty programs worth joining in europe.

Currently i joined the free member version of accor(all) group.

I did some research on here and found out other programs worth joining might be ihg, Hilton, Marriott, gha discovery.

When I travel i mostly stay at a 3 star hotel. I have stayed at ibis and novotel in the past. I have never stayed at Hilton or mariott