Cressi Newton

If you're within your first 6-12 months of structured freediving and don't yet need programmable depth alarms, the Newton does everything you actually need at less than half the price. The D4f earns its premium when you're doing serious depth progression training with specific target depths per session. Before that point, the Newton's simplicity is appropriate.

For most recreational divers: no. 40m covers a depth range most divers never reach. If you're planning to push past 30-35m consistently, the 100m-rated D4f gives more comfortable margin. But for the majority of recreational freediving, 40m is adequate.

Yes. It displays the time since your last dive. This is the feature that separates a proper freedive computer from a simple depth gauge, and the Newton does it correctly.