Whirlpool 29"
With the lint screen on the top.
Reasons:
All-around top performing dryer.
Easy to clean, fix, and/or repair.
Rarely needs repair.
Parts are plentiful.
Tend to stay pretty clean inside.
I could go on, but the lint-screen-on-top dryers are, in my opinion, simply the best dryers on the market today. I don't care for the hybrid dryers (modified design of the lint-screen-on-top dryers, commonly sold with top-loading high efficiency). These dryers use some more obscure and expensive parts.
I'd look for a 29" dryer with a moisture sensor (black thing with 2 shiny metal strips on the back wall of the drum at about the 4:00 position). I'd also look for one with a drum light (located on the back wall of the drum) just for the convenience of it. Some of these dryers have bottom-hinged doors and others have side-hinged doors. Get whichever you want. Some have removable kick panels below the door, particularly on the gas models. These panels make cleaning easier and I'd look for one.
Happy drying,
Dave