SATS not much to say since it has been commented many times here. Decor nothing special, prefer the T3 for its “alfresco” seating ambience. T3 afaik only 1 shower. T2 3-4 showers but Super small n uncomfortable to use. Probably laksa is only standout dish there.
Dnata T3 has my preferred seating. Nice, bright, airy on the “alfresco” area. Plenty of showers and wider range of reading materials. Satay service quite ok. T1 newer decor, wider n better spread of food than SATS imo
Plaza Premium has nice tarmac view, lounging chairs right in front of windows. Good shower facilities and I like the fresh made to order food (chicken rice, hand roll...etc) best of all among the lounges, with exception of TGM.
T4 Blossoms (collaboration between Plaza Premium and SATS) very nice. I like to hang out facing the Peranakan shophouses or around the bar area. Only 2 shower rooms but very spacious. Food spread pretty good, arguably the best amongst Priority Pass lounges in Changi. Only times when I go over to T2 is when I feel like eating sashimi at TGM. Otherwise very nice to spend time here