Amazon has the Kidde PI2010 Smoke Alarm Dual Sensor for $20 - $3 off at checkout = $17 with free shipping on $25+. Normally found for around $25+. Features both a photoelectric and ionization sensor. Excellent user reviews.
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Showed up at $30 in my cart and at checkout. I selected Amazon as the seller with FSSS.
I'm sorry but you exceeded the one minute time period from the posting to qualify for this sale price...
Aw shucks.
In general, photoelectric detectors are what you want. They react to the large particles that result from slow-smoldering fires that typically start in walls and kill people in their sleep.
but if you have to pick just one, go photo.
Ionization detectors are more sensitive to the small particles from fast-burning fires, of the sort that start on the stove while you're standing right there and don't need a beeping thing to tell you about.
A unit with both is a fine idea.