There is no absolute answer to this question.
Your browsing experience, meaning mostly the lag to open or browse a web service, is depended on the resources of the obfuscate bridge you connect to. We can assume with fair certainty that some obfs bridges have more resources than other.
What's more, your experience will vary due to variance of usage of the obfs bridge in use, meaning if many users are exhausting its resources.
Finally your browsing experience will be degraded if one or more of the obfproxies you've chosen go offline. In that case you are not as flexible as when you connect to ordinary guard nodes. Instead, you have to fetch more obfs bridges' IPs and use them as entry nodes.
An insight on how Tor Project is distributing obfs bridges to users could be helpful but again obfs bridges and normal bridges is part of an arms race. Tor Projects needs to distribute bridge IPs to good people while keeping them secret from bad people. That makes public info on obfs bridges less accessible.
Generally, my understanding is that bridges and obfs bridges are fewer than needed and an average bridge has less bandwidth than an average guard node.
Of course a bridge with lower advertised bandwidth should be used by/distributed to fewer users, but that's not entirely controllable since it involves many parameters.