Hi mem,
As you already know 
Bascom offers:
Integrated commands for LCDs Char/Graphic, I2C chips, 1WIRE chips, Keypads, RC5, RC6, Buffered H/W UARTs, S/W UARTs, SPI and much more. Plus there are more than 140 examples.
Perhaps you will be kind enough to provide links to the Arduino equivalents, so the potential user can make their own judgement 
Equally important are extensive and Indexed Help files - here is the on line version:
http://avrhelp.mcselec.com/index.html
and is also included in the download.
Again, allow the user to make their own judgement by kindly supplying a link