Townshend is reported to be much better than Isoacoustics Gaia. However, the price is higher and as a result it’s more suitable for higher end systems or speakers. There are folks who upgraded from the Gaia to Townshend and found the latter to sound noticeably better. The difference is claimed to be not subtle.
Isoacoustics Gaia can work on all surfaces - concrete, wood, tile or carpet. Carpet discs(additional cost) can be used with the Gaias if the floor is carpet. With Gaias, it’s mostly an improvement but there are cases where people don’t hear a difference, or it’s a degradation rather than improvement. With the Townshend, I believe the success rate is 100%.
If tight on funds, I can highly recommend the Isoacoustics Gaia.