Work has brought me to Surabaya frequently this year, and have stayed multiple times at the Sheraton, the Westin, and the JW.

Between the Sheraton and the JW:
- Location: Sheraton wins, as it's directly connected to one of the biggest malls in Indonesia. However, the JW is just 500m down the road and they offer hourly shuttle service to and from the same mall on weekends, and on request on weekdays. Also was told that even on weekends, Elites could actually request the hotel to drive them to and from the mall anytime they wish. Although not a published benefit, so YMMV.
- Elite recognition: When not using SNA, Sheraton only upgrades to a Junior suite, which is not a true suite but rather just a larger corner room with a daybed. Whereas the JW will always upgrade Elites to a true 1-bedroom Suite at the JW when there is availability, even when not using SNA.
- Lounge: Both have a very decent Club Lounge. Sheraton's lounge is very small though and frequently overrun with families with kids, especially on weekends. The lounge at the JW is much bigger and they don't allow kids under 7 at the Lounge. While the spread at both lounges has a good variety of items, they are served in tiny portions. Certainly no substitute for dinner as you'll sometimes see in Asian Club Lounges. Drinks are served from 5 to 8pm (with food from 6 to 8pm) at the Sheraton. While it's 5:30 to 9:30pm for drinks at the JW, with food from 5:30 to 7:30pm.
- Breakfast: Lounge only at both the Sheraton and the JW. You can give up the 1000 points and choose restaurant breakfast at the Sheraton (which I normally do), no such option at the JW.
- Service: Very little separates the two, both have some of the friendliest, kindest, and most helpful people in hospitality. Can't say enough good things about the staff at both. I would say the JW wins though by a small margin, they send pre-arrival and post-stay emails, provide welcome amenities (not always done at the Sheraton) and constantly check up on me throughout the stay to inquire on the quality of my stay, etc.
- Both hotels are fairly aged. Sheraton was recently renovated and looks much better than it was before the pandemic, although one can still tell that the shell is old. The JW looks and feels older, but it is not like it's rundown or anything and the finishes are higher quality than the Sheraton (even post-renovation)

I will have to say the Westin is the best Bonvoy option in Surabaya though, where both the hardware and the software are in a completely different league compared to the Sheraton and the JW. But between the Sheraton and the JW, I will say the JW is the better choice, but I don't think you can go wrong choosing one or the other.

Feel free to ask if you have anymore questions.