film isn't very forgiving to variations in time/temp/dilution. there are developers, however; that will be more forgiving.
the most versatile film is hp5 (empirically evidenced). can be shot from ei 200 to ei 1600 with ease. i've seen it shot up to ei 25,000....yep; u read that correctly.
probably the most forgiving developer is diafine. i must add that choosing a film/developer combination based on the inability to measure dilutions, tell time, and use a thermometer won't produce spectacular results. a film/developer combination to achieve desired results is highly recommended.