MBR equals msdos for gparted?

Yes msdos is the same as MBR so use it.

The MBR partitioning scheme is the same regardless of OS (and should work provided your drive is < 2.2TB). FDISK as well as the other equivalents will do this for you.

If you want the partition to be "MSDOS" compatible you will need to select a FAT partition type - The highest version will depend on the version of MSDos.

For MS-DOS 2.x type 1 (FAT 12) For MS-DOS 3.0 or greater type 6 (FAT 16)

Note that versions of MS-Dos prior to 3.3 you can only have a single partition, and before MS-DOS 4.0 the largest partition was 32 Megs. If you are wanting a "Windows Compatible" type, select FAT 32 (type b). This is probably what gparted uses.