I definitely prefer
Erika over
Linda.
Linda strikes me as dated and stodgily middle aged.
Erika could be practically any age. Perhaps because of its Nordic roots and
Eric the red, I picture
Erika as a confident, bold, powerful woman with red hair and a statuesque figure. Someone who could have been a battle maiden in an earlier time.
Erica seems a little more genteel, and
Erika has more of a punk-rock stride. I like both for different reasons, and both have strong personalities.