Fungi is 150HP per minute.
Jeldorin is 162HP per proc.
If you average more than one proc per minute, Jeldorin will heal you faster. However, you must be in combat to proc it. So I would say Fungi is generally better, unless your playstyle/preferred combat locations give you a constant stream of mobs to whack at.
EDIT: For example, if you almost always group, and those groups generally pull a lot of mobs (Like Karnors Castle or the Hole), Jeldorin might be better if you can average one proc a minute, just in terms of pure ability to heal yourself. If you like to solo for a decent portion of your playtime, or your grouping situations tend to have slower pulls, then Fungi would be better. This is why I say Fungi is generally better, as it works well in all situations, where Jeldorin is only better in a specific scenario. Obviously having both is best, but the way you pose the question makes me assume you can only afford one right now
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If you think you do fit into the "constant stream of mobs" model, I would advise equipping a 1h proc weapon and record how many times per hour you proc it. If you generally get more than 1 proc per minute, then Jeldorin might be a good option, otherwise go Fungi.