Ripple Data API vs Ripple RPC

Ripple Data API vs Ripple RPC

I need to write a program that monitors the transactions that sent to me. My approach is to periodically (like every 2 minutes) call the Ripple public api to get transactions for my account. But on the developer doc, I find two way to achieve this:

1. Ripple Data API . example:

https://data.ripple.com/v2/accounts/rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn/transactions?type=Payment&result=tesSUCCESS&limit=3

2. WebSocket/Json-RPC API. send to s2.ripple.com:443 with websocket or http. example:

{ "id": 1, "command": "account_tx",
"account": "r9cZA1mLK5R5Am25ArfXFmqgNwjZgnfk59",
"ledger_index_min": -1,
"ledger_index_max": -1,
"binary": false, "count": false,
"limit": 10, "forward": false }

I didn't check carefully, but they seem to have same response(with different format).

My question is :

1. are they equivalent?

2. which one should be preferred or which one is recommended by ripple?

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