Compare the specs of the Brunswick Ethos and Brunswick Ultimate Defender side by side in the ball comparison table below. To view the full bowling ball review for one of these balls, click the ball name link in the table below.
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| Brand | Brunswick | Brunswick |
| Ball Name | Ethos | Ultimate Defender |
| Cover Name | HK22 - SH 4.0 Pearl | HK22 - ACT 3.0 Hybrid |
| Cover Type | Reactive Pearl | Reactive Hybrid |
| Box Finish | 500 / 1000 / 1500 SiaAir / Crown Factory Compound | 500 / 2000 SiaAir |
| Color | Purple / Sky / Carbon | Violet / Pink / Navy |
| Core Name | Ethos | Portal X |
| Core Type | Symmetrical | Asymmetrical |
| RG | 2.481 | 2.473 |
| Total Diff. | 0.053 | 0.054 |
| Int. Diff. | 0.000 | 0.015 |
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