These flowering annuals will supply you with bright flowers all through the growing season. Many bedding plants come in light plastic cell packs nowadays. Plants are easily removed by pushing on the bottom of the individual cells. On no account should you pull on the stems of the plants. To do so is to risk severing the top from the bottom, and action not favorable to plant growth.
Peat pots are a little trickier.
The lure of the peat pots is the promise that you can plant it pot and all, minimizing disturbance to the roots. The difficulty is, peat pots are hard to wet, and a dry pot can corm a barrier between the roots and the soil. It'll be a month of Sundays before that pot breaks down. I always soak the peat pot before I plant it, and I rip the top off the pot and drop it in the bottom of the planting hole. I then break the pot in three or four places before I plant it, to allow cracks for root growth into the soil.